Get your engine Ready---White to play and Win

[Cubeman]

I tested some mobile PDA/iOS devices.StockFish on iphone 4s finds the main line in under 3 minutes with +5 score.Naum 4.2 on Pocketfritz also finds the winning line under 2 minutes. Hiarcs / Tiger find position too difficult.
Main line goes 1.Bb2 Nd2 2.c4 Nxc4 3.Kb4 Nxb2 4.Kb3 and winning.All my PDA chess apps DON'T have Tablebases http://www.chessbase.com/newsdetail.asp?newsid=8008
I wonder how much of main line Yusupov found.

Just tested the iPhone version of Hiarcs which is 13.31 and it does solve correctly, it was the PocketFritz version 13.1 which couldn't solve it.

[pichy]

I tested some mobile PDA/iOS devices.StockFish on iphone 4s finds the main line in under 3 minutes with +5 score.Naum 4.2 on Pocketfritz also finds the winning line under 2 minutes. Hiarcs / Tiger find position too difficult.
Main line goes 1.Bb2 Nd2 2.c4 Nxc4 3.Kb4 Nxb2 4.Kb3 and winning.All my PDA chess apps DON'T have Tablebases http://www.chessbase.com/newsdetail.asp?newsid=8008
I wonder how much of main line Yusupov found.[/qveuote]


Have you pit stocjfish vs Umko 1.3 or Hannibal at 10 second per move

I don't test PC engines anymore, the last PC chess set up I owned was a Dell Pentium IV 3.2ghz running Hiarcs 9 which was about 10 years ago the computer died about 4 years ago.I have played mini matches of the various PDA combinations but found it too time consuming and now just enjoy playing and analysing positions with the mobile devices now.

I have been looking for Hiarcs 9 for a while , how much do you want for it and I will send you the money for it.

[zullil]

When you are letting an engine to solve an endgame position you should avoid using tablebases, otherwise the engine is NOT solving at all.

Critter, with tablebases disabled:

Code: Select all

Critter v1.4 64-bit SSE4, by Richard Vida
setoption name Hash value 4096
setoption name Tablebase Usage value Disable
setboard 8/8/8/8/4n3/K1P5/P1P5/Bk6 w - - 0 1
info string Opening book: "book.cbk" - 57853 entries [native]
info string GTB Init OK (5 piece set)
info string Using 8 thread(s), 4096 MB hash
go infinite
 2/ 2  00:00        29       0  +1.28 Bb2 Kxc2 c4 Kd3
 3/ 4  00:00        96       0  +0.05 Bb2 Nd2 Ba1 Kxa1
 4/ 5  00:00       164       0  +0.05 Bb2 Nd2 Bc1 Kxc1
 5/ 7  00:00       351  351000  +0.05 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2
 6/ 9  00:00       549  549000  +0.05 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 a4 Kc1
 6/11  00:00      1929  321500  +0.78 Kb4 Kxa1 a4 Kb2 a5 Kc1 c4 Kd2 a6 Ke3
 7/12  00:00      4766  366615  +0.96 Kb4 Kxa1 a4 Nf6 a5 Nd5+ Kb3 Nc7 c4 Ne6
 8/13+ 00:00      5720  408571  +1.05 Kb4 Kxa1 a4 Nf6 a5 Nd5+ Kb3 Nc7 c4 Na6
 8/13+ 00:00      6419  401187  +1.13 Kb4 Kxa1 a4 Nf6 a5 Nd5+ Kb3 Nc7 c4 Na6
 8/13+ 00:00      7024  439000  +1.26 Kb4 Kxa1 a4 Nf6 a5 Nd5+ Kb3 Nc7 c4 Na6
 8/13+ 00:00      7673  451352  +1.45 Kb4 Kxa1 a4 Nf6 a5 Nd5+ Kb3 Nc7 c4 Na6
 8/13  00:00      9446  497157  +1.35 Kb4 Kxa2 c4 Kxa1 c5 Nf6 c6 Ne8 Kc5 Kb2 Kb6
 9/18- 00:00     18012  529764  +1.27 Kb4 Kxa2 c4 Kxa1 c5 Nf6 c6 Ne8 Kc5 Kb2 Kb6
 9/18- 00:00     20572  541368  +1.18 Kb4 Kxa2 c4 Kxa1 c5 Nf6 c6 Ne8 Kc5 Kb2 Kb6
 9/19  00:00     32218  657510  +1.20 c4 Kxa1 Kb4 Kxa2 c5 Ng5 c6 Ne6 Kc4 Nc7 Kc5 Kb2 Kd6 Ne8+ Kd7 Nf6+ Ke6 Ne8
10/19+ 00:00     39830  724181  +1.28 c4 Kxa1 Kb4 Kxa2 c5 Ng5 c6 Ne6 Kc4 Nc7 Kc5 Kb2 Kd6 Ne8+ Kd7 Nf6+ Ke6 Ne8
10/19+ 00:00     51429  791215  +1.37 c4 Kxa1 Kb4 Kxa2 c5 Ng5 c6 Ne6 Kc4 Ka3 Kd5 Nc7+ Kd6 Ne8+ Kd7 Nf6+ Ke7 Nd5+ Kd6
10/19+ 00:00     58947  842100  +1.50 c4 Kxa1 Kb4 Kxa2 c5 Ng5 c6 Ne6 Kc4 Ka3 Kd5 Nc7+ Kd6 Ne8+ Kd7 Nf6+ Ke7 Nd5+ Kd6
10/21  00:00     64149  822423  +1.30 c4 Kxa1 Kb4 Kxa2 c5 Ng5 c6 Ne6 Kc4 Ka3 Kd5 Nc7+ Kd6 Ne8+ Kd7 Nf6+ Ke7 Nd5+ Kd6
11/25  00:00     95691  886027  +1.27 c4 Kxa1 Kb4 Kxa2 c5 Ng5 c6 Ne6 c3 Kb2 Ka5 Nc7 Kb6 Nd5+ Kc5 Nc7 c4 Kc2 Kd6
12/25- 00:00    142869  965331  +1.18 c4 Kxa1 Kb4 Kxa2 c5 Ng5 c6 Ne6 c3 Kb2 Ka5 Nc7 Kb6 Nd5+ Kc5 Nc7 c4 Kc2 Kd6
12/25  00:00    162776 1017350  +1.14 c4 Kxa1 Kb4 Kxa2 c5 Nf6 c6 Ne8 c3 Kb2 Kb5 Kb3 Ka6 Kc2 Kb7 Nd6+ Kc7 Ne4
13/29- 00:00    313124 1199708  +1.05 c4 Kxa1 Kb4 Kxa2 c5 Nf6 c6 Ne8 c3 Kb2 Kb5 Kb3 Ka6 Kc2 Kb7 Nd6+ Kc7 Ne4
13/29  00:00    357309 1236363  +1.01 c4 Kxa1 Kb4 Kxa2 c5 Nf6 c6 Kb2 Kc5 Ne8 Kc4 Nd6+ Kb4 Ne8 c3 Nc7 Ka5 Kc2 Kb6 Nd5+ Kb7 Kxc3 c7
14/29+ 00:00    470910 1319075  +1.10 c4 Kxa1 Kb4 Kxa2 c5 Nf6 c6 Kb2 Kc5 Ne8 Kc4 Nd6+ Kb4 Ne8 c3 Nc7 Ka5 Kc2 Kb6 Nd5+ Kb7 Kxc3 c7
14/29+ 00:00    511215 1366885  +1.18 c4 Kxa1 Kb4 Kxa2 c5 Nf6 c6 Kb2 Kc5 Ne8 Kc4 Nd6+ Kb4 Ne8 c3 Nc7 Ka5 Kc2 Kb6 Nd5+ Kb7 Kxc3 c7
14/36+ 00:00    822926 1493513  +1.31 c4 Kxa1 Kb4 Kxa2 c5 Nf6 c6 Kb2 Kc5 Ne8 c4 Kc3 Kb6 Kb3 Kb7 Kxc4 Kb6 Nf6 Ka7 Ne8 Kb6
14/43+ 00:00   1255076 1682407  +1.50 c4 Kxa1 Kb4 Kxa2 c5 Nf6 c6 Kb2 Kc5 Ne8 c4 Kc3 Kb6 Kb3 Kb7 Kxc4 Kb6 Nf6 Ka7 Ne8 Kb6
14/45  00:00   1632019 1787534  +1.05 c4 Kxa1 Kb3 Nd2+ Kc3 Ne4+ Kd4 Nd6 Kd5 Nc8 a4 Nb6+ Kd4 Ka2 c5 Nc8 c6 Ka3 Kd5 Kxa4 Kc5 Ka5 c7 Ka6 Kc6 Ne7+ Kd7 Kb7 c4 Kb6 c5+ Kb7 c8=R Nxc8 c6+ Kb8 Kd8 Nb6 c7+ Kb7
15/45  00:00   1665039 1790364  +1.10 c4 Kxa1 Kb3 Nd2+ Kc3 Ne4+ Kd4 Nd6 Kd5 Nc8 a4 Nb6+ Kd4 Ka2 c5 Nc8 c6 Ka3 Kd5 Kxa4 Kc5 Ka5 c7 Ka6 Kc6 Ne7+ Kd7 Kb7 c4 Kb6 c5+ Kb7 c8=R Nxc8 c6+ Kb8 Kd8 Nb6 c7+ Kb7
16/45+ 00:00   1774024 1812077  +1.18 c4 Kxa1 Kb3 Nd2+ Kc3 Ne4+ Kd4 Nd6 Kd5 Nc8 a4 Nb6+ Kd4 Ka2 c5 Nc8 c6 Ka3 Kd5 Kxa4 Kc5 Ka5 c7 Ka6 Kc6 Ne7+ Kd7 Kb7 c4 Kb6 c5+ Kb7 c8=R Nxc8 c6+ Kb8 Kd8 Nb6 c7+ Kb7
16/45+ 00:01   1836024 1830532  +1.27 c4 Kxa1 Kb3 Nd2+ Kc3 Ne4+ Kd4 Nd6 Kd5 Nc8 a4 Nb6+ Kd4 Ka2 c5 Nc8 c6 Ka3 Kd5 Kxa4 Kc5 Ka5 c7 Ka6 Kc6 Ne7+ Kd7 Kb7 c4 Kb6 c5+ Kb7 c8=R Nxc8 c6+ Kb8 Kd8 Nb6 c7+ Kb7
16/45+ 00:01   1945258 1863273  +1.40 c4 Kxa1 Kb3 Nd2+ Kc3 Ne4+ Kd4 Nd6 Kd5 Nc8 a4 Nb6+ Kd4 Ka2 c5 Nc8 c6 Ka3 Kd5 Kxa4 Kc5 Ka5 c7 Ka6 Kc6 Ne7+ Kd7 Kb7 c4 Kb6 c5+ Kb7 c8=R Nxc8 c6+ Kb8 Kd8 Nb6 c7+ Kb7
16/45- 00:01   2511927 1957854  +1.01 c4 Kxa1 Kb3 Nd2+ Kc3 Ne4+ Kd4 Nd6 Kd5 Nc8 a4 Nb6+ Kd4 Ka2 c5 Nc8 c6 Ka3 Kd5 Kxa4 Kc5 Ka5 c7 Ka6 Kc6 Ne7+ Kd7 Kb7 c4 Kb6 c5+ Kb7 c8=R Nxc8 c6+ Kb8 Kd8 Nb6 c7+ Kb7
16/45+ 00:01   2995943 2069021  +1.59 c4 Kxa1 Kb3 Nd2+ Kc3 Ne4+ Kd4 Nd6 Kd5 Nc8 a4 Nb6+ Kd4 Ka2 a5 Nc8 Kc5 Ka3 Kb5 Na7+ Kb6 Nc8+ Kb7 Nd6+ Kc6 Nf5 a6 Nd4+ Kc5
16/52  00:01   4397835 2323209  +1.01 Bb2 Nd2 Kb4 Kxa2 Bc1 Ne4 c4 Kb1 c3 Kxc1 c5 Nf6 c6 Kd2 Kc4 Ne8 Kd4 Kc2 c4 Nc7 Kc5 Kd3 Kb6 Na8+ Kb7
17/52+ 00:02   4807278 2403639  +1.10 Bb2 Nd2 Kb4 Kxa2 Bc1 Ne4 c4 Kb1 c3 Kxc1 c5 Nf6 c6 Kd2 Kc4 Ne8 Kd4 Kc2 c4 Nc7 Kc5 Kd3 Kb6 Na8+ Kb7
17/52+ 00:02   5249285 2483105  +1.18 Bb2 Nd2 Kb4 Kxa2 Bc1 Ne4 c4 Kb1 c3 Kxc1 c5 Nf6 c6 Kd2 Kc4 Ne8 Kd4 Kc2 c4 Nc7 Kc5 Kd3 Kb6 Na8+ Kb7
17/52+ 00:02   5453565 2502783  +1.31 Bb2 Nd2 Kb4 Kxa2 Bc1 Ne4 c4 Kb1 c3 Kxc1 c5 Nf6 c6 Kd2 Kc4 Ne8 Kd4 Kc2 c4 Nc7 Kc5 Kd3 Kb6 Na8+ Kb7
17/52+ 00:02   5779674 2519474  +1.50 Bb2 Nd2 Kb4 Kxa2 Bc1 Ne4 c4 Kb1 c3 Kxc1 c5 Nf6 c6 Kd2 Kc4 Ne8 Kd4 Kc2 c4 Nc7 Kc5 Kd3 Kb6 Na8+ Kb7
17/52+ 00:02   6541879 2605288  +1.79 Bb2 Nd2 Kb4 Kxa2 Bc1 Ne4 c4 Kb1 c3 Kxc1 c5 Nf6 c6 Kd2 Kc4 Ne8 Kd4 Kc2 c4 Nc7 Kc5 Kd3 Kb6 Na8+ Kb7
17/52+ 00:02   7543732 2708700  +2.21 Bb2 Nd2 Kb4 Kxa2 Bc1 Ne4 c4 Kb1 c3 Kxc1 c5 Nf6 c6 Kd2 Kc4 Ne8 Kd4 Kc2 c4 Nc7 Kc5 Kd3 Kb6 Na8+ Kb7
17/52  00:02   8330871 2778809  +2.25 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Kb1 c4 Nd3 a4 Ne5 a5 Nc6 a6 Na7 c5 Kc1 Kb4 Kc2 Ka5 Nc8 c6 Kd3 c7 Kd4 a7 Nxa7 Kb6 Nc8+ Kb7
18/52  00:03   8754732 2819559  +2.25 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Kb1 c4 Nd3 a4 Ne5 a5 Nc6 a6 Kc1 c5 Na7 Kb4 Kc2 Ka5 Nc8 c6 Kd3 c7 Kd4 a7 Nxa7 Kb6 Nc8+ Kb7
19/52+ 00:03  10349594 2946923  +2.39 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Kb1 c4 Nd3 a4 Ne5 a5 Nc6 a6 Kc1 c5 Na7 Kb4 Kc2 Ka5 Nc8 c6 Kd3 c7 Kd4 a7 Nxa7 Kb6 Nc8+ Kb7
19/52- 00:03  10405782 2939486  +2.11 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Kb1 c4 Nd3 a4 Ne5 a5 Nc6 a6 Kc1 c5 Na7 Kb4 Kc2 Ka5 Nc8 c6 Kd3 c7 Kd4 a7 Nxa7 Kb6 Nc8+ Kb7
19/52+ 00:04  12214398 3051311  +2.53 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Kb1 c4 Nd3 a4 Ne5 a5 Nc6 a6 Kc1 c5 Na7 Kb4 Kc2 Ka5 Nc8 c6 Kd3 c7 Kd4 a7 Nxa7 Kb6 Nc8+ Kb7 Nd6+ Kc6 Ke5 Kd7 Nc4 Ke8 Nb6 Kd8 Kd6
19/52+ 00:04  14534242 3210568  +2.75 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Kb1 c4 Nd3 a4 Ne5 a5 Nc6 a6 Kc1 c5 Na7 Kb4 Kc2 Ka5 Nc8 c6 Kd3 c7 Kd4 a7 Nxa7 Kb6 Nc8+ Kb7 Nd6+ Kc6 Ke5 Kd7 Nc4 Ke8 Nb6 Kd8 Kd6
19/52+ 00:05  17921076 3405753  +3.06 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Kb1 c4 Nd3 a4 Ne5 a5 Nc6 a6 Kc1 c5 Na7 Kb4 Kc2 Ka5 Nc8 c6 Kd3 c7 Kd4 a7 Nxa7 Kb6 Nc8+ Kb7 Nd6+ Kc6 Ke5 Kd7 Nc4 Ke8 Nb6 Kd8 Kd6
19/52  00:05  18457620 3412390  +3.01 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Nd1 a4 Nf2 c4 Ne4 Kb4 Kd2 a5 Nd6 c5 Nc8 c6 Ke3 Kc5 Ke4 a6 Ke5 c7 Na7 Kb6 Kd6 Kb7 Kd7
20/52+ 00:06  23436044 3543399  +3.20 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Nd1 a4 Nf2 c4 Ne4 Kb4 Kd2 a5 Nd6 c5 Nc8 c6 Ke3 Kc5 Ke4 a6 Ke5 c7 Na7 Kb6 Kd6 Kb7 Kd7
20/52- 00:06  23948128 3535822  +2.83 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Nd1 a4 Nf2 c4 Ne4 Kb4 Kd2 a5 Nd6 c5 Nc8 c6 Ke3 Kc5 Ke4 a6 Ke5 c7 Na7 Kb6 Kd6 Kb7 Kd7
20/52+ 00:08  29590979 3651404  +3.39 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Nd1 a4 Nf2 c4 Ne4 Kb4 Kd2 a5 Nd6 c5 Nc8 c6 Ke3 Kc5 Ke4 a6 Ke5 c7 Na7 Kb6 Kd6 Kb7 Kd7
20/52  00:09  35551192 3730058  +3.53 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Na5+ Kb4 Nxc4 a4 Nd6 Kc5 Nc8 Be5 Kc2 a5 Kd3 a6 Ke4 Bb8 Kf5 Kc6 Ke6 Bh2 Na7+ Kb7 Nb5 Kb6 Nc3 a7 Nd5+ Kb7
21/52  00:10  38687965 3708585  +3.44 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Na5+ Kb4 Nxc4 a4 Nd6 Kc5 Nc8 Be5 Kc2 a5 Kd3 a6 Ke4 Bb8 Kf5 Kc6 Ke6 Bh2 Ke7 Bd6+ Ke8 Ba3 Na7+ Kb6 Nc8+ Kb7 Kd7 Bc5 Kd8 a7
22/52+ 00:13  53032682 3869868  +3.66 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Na5+ Kb4 Nxc4 a4 Nd6 Kc5 Nc8 Be5 Kc2 a5 Kd3 a6 Ke4 Bb8 Kf5 Kc6 Ke6 Bh2 Ke7 Bd6+ Ke8 Ba3 Na7+ Kb6 Nc8+ Kb7 Kd7 Bc5 Kd8 a7
22/53+ 00:17  68760979 3992856  +3.87 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Na5+ Kb4 Nxc4 a4 Nd6 Kc5 Nc8 Be5 Kc2 a5 Kd3 a6 Ke4 Bb8 Kf5 Kc6 Ke6 Bh2 Ke7 Bd6+ Ke8 Ba3 Na7+ Kb6 Nc8+ Kb7 Kd7 Bc5 Kd8 a7
22/55  00:20  83571426 4073872  +3.88 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Kd2 Ba1 Ne6 Bf6 Nc7 Kb3 Ke3 a4 Kf4 Kb4 Kf5 Ba1 Ke6 Kc5 Na6+ Kb5 Nb8 a5 Kd6 Bb2 Nc6 Kb6 Nb8 Ba3+ Kd7 a6 Nc6 c5
23/55  00:25 105539047 4064822  +3.98 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Na6 Be5 Nc5 Bd4 Ne6 Bf6 Nc5 Kb4 Nd3+ Kc3 Nc5 Bd4 Na6 Kb3 Kc1 c5 Nb8 Ba1 Kd2 a4 Ke3 Kb4 Ke4 Kc4 Nc6 Bf6 Na7 Bc3 Nc6 a5 Nb8 Bf6 Kf5 Ba1 Ke6 Kb5 Kd5 Bd4 Nc6 Bf2 Na7+ Kb6 Nc8+ Kb7 Ne7 a6 Nc6 Kb6 Ne7 Be1
24/55  00:35 141276377 4016385  +4.19 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Kb1 Bd4 Kc2 c5 Nb8 Kb4 Kd3 Ba1 Na6+ Kb5 Nc7+ Kb6 Nd5+ Kb7 Kc4 c6 Kb5 c7 Nxc7 Kxc7 Ka6 Bd4 Kb5 Kd7 Kb4 Bb2 Kc5 Kc7 Kb5 Bc1 Kc5 Be3+ Kb4 Bc1 Kb5 a3 Ka6 Kb8 Kb5 Kb7 Kc5 Bf4 Kb5 Bd6 Ka4 Kb6
25/57  00:46 187514338 4012031  +4.24 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Kd3 Kb4 Nb6 c5 Nd5+ Kb5 Nc7+ Kb6 Nd5+ Kb7 Kc4 c6 Kb4 Bb2 Ka4 c7 Nxc7 Kxc7 Kb5 Ba3 Kc4 Bc1 Kb5 Bf4 Kc5 Be5 Kb5 Bf6 Ka5 Bb2 Kb5
26/61  01:05 263872348 4020483  +4.45 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Kd3 Kb4 Nb6 c5 Nd5+ Kb5 Nc7+ Kc6 Kc4 Kxc7 Kxc5 Be5 Kb5 Bf6 Kc5 Bd4+ Kb4 Bb2 Kc5 Kb7 Kb5 a3 Ka5 Kc6 Ka4 Bc1 Ka5 Bb2
27/61  01:14 296887024 3967751  +4.45 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Kd3 Kb4 Nb6 c5 Nd5+ Kb5 Nc7+ Kc6 Kc4 Kxc7 Kxc5 Be5 Kb5 Bf6 Ka5 Bd4 Kb4 Bb2 Kc5 Kb7 Kb5 Ba3 Ka4 Be7 Kb5 Bd6 Ka5 Ba3 Ka4
28/61  01:27 343971273 3921554  +4.45 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Kd3 Kb4 Nb6 c5 Nd5+ Kb5 Nc7+ Kc6 Kc4 Kxc7 Kxc5 Be5 Kb5 Bf6 Ka5 Bb2 Ka6 Bd4 Kb5 Kb8 Ka6 Ba1 Ka5 Kb7 Kb5 Bf6 Ka4 Be7 Kb5 Bd6 Ka5 Ba3 Ka4 Be7
29/61  01:45 416014434 3961702  +4.45 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Kd2 Ba1 Na6 Ka4 Kd3 Kb5 Nc7+ Kb6 Ne6 c5 Kc4 c6 Nf4 c7 Nd5+ Kc6 Nxc7 Kxc7 Kb5 Be5 Ka6 Bd4 Kb5 Kb8 Ka6 Ba1 Ka5 Bb2 Kb4 Ka7 Ka5 Ba3 Ka4 Bd6 Kb5 Kb7 Ka5 Be5 Kb4 Bb2 Ka5 Ka7 Kb5 Ba3 Ka4
30/61+ 02:30 598576199 3977197  +4.73 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Kd2 Ba1 Na6 Ka4 Kd3 Kb5 Nc7+ Kb6 Ne6 c5 Kc4 c6 Nf4 c7 Nd5+ Kc6 Nxc7 Kxc7 Kb5 Be5 Ka6 Bd4 Kb5 Kb8 Ka6 Ba1 Ka5 Bb2 Kb4 Ka7 Ka5 Ba3 Ka4 Bd6 Ka5 a3 Kb5 Bb4 Kc4 Kb6 Kb3 Kb5 Kc2 a4 Kb3 a5
30/61+ 03:35 867644979 4027876  +5.00 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Kd2 Ba1 Na6 Ka4 Kd3 Kb5 Nc7+ Kb6 Ne6 c5 Kc4 c6 Nf4 c7 Nd5+ Kc6 Nxc7 Kxc7 Kb5 Be5 Ka6 Bd4 Kb5 Kb8 Ka4 Bb2 Kb4 Kc8 Ka5 Kb7 Kb5 a3 Ka5 Ka7 Kb5 Be5 Ka4 Bd6 Ka5 Bb4+ Kb5 Kb7 Kc4 Kb6 Kb3 Kb5 Kb2 a4 Kb3 a5
30/64+ 04:48 1196858404 4149260  +5.42 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Kd2 Ba1 Na6 Ka4 Kd3 Kb5 Nc7+ Kb6 Ne6 c5 Kc4 c6 Nf4 c7 Nd5+ Kc6 Nxc7 Kxc7 Kb5 Be5 Ka6 Bd4 Kb5 Kb8 Kb4 Bb2 Ka4 Kb7 Kb5 a3 Ka5 Ka7 Kb5 Be5 Ka4 Bd6 Ka5 Bb4+ Kb5 Kb7 Kc4 Kb6 Kb3 Kb5 Kc2 a4 Kd3 a5
30/69  06:16 1587431064 4216609  +5.58 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Kd2 Ba1 Na6 Ka4 Kd3 Kb5 Nc7+ Kb6 Ne6 c5 Kc4 c6 Nf4 c7 Nd5+ Kc6 Nxc7 Kxc7 Kb5 Be5 Kc5 Bf6 Kb4 Be7+ Kb5 Kb7 Ka4 Bd6 Kb5 a3 Ka5 Bb4+ Kb5 Be7 Ka5 Bc5 Kb5 Bb4 Kc4 Kb6 Kb3 Kb5 Kb2 a4 Kc2 Bd6 Kc3 Be5+ Kd3 a5 Ke4 Bd6 Kd5 Ba3 Kd4 Bb4 Kd5 a6 Kd4 a7
31/69+ 08:05 2104437339 4335541  +5.93 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Kd2 Ba1 Na6 Ka4 Kd3 Kb5 Nc7+ Kb6 Ne6 c5 Kc4 c6 Nf4 c7 Nd5+ Kc6 Nxc7 Kxc7 Kb5 Be5 Ka6 Kb8 Ka5 Kb7 Ka4 Bb2 Ka5 Ba3 Ka4 Bd6 Kb5 a3 Ka5 Bb4+ Kb5 Ka7 Kc4 Kb6 Kb3 Kc6 Ka4 Bd6 Ka5 Kb7 Kb5 Bb4 Kc4 Kb6
31/69+ 10:23 2748107407 4408476  +6.28 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Kd2 Ba1 Na6 Ka4 Kd3 Kb5 Nc7+ Kb6 Ne6 c5 Kc4 c6 Nf4 c7 Nd5+ Kc6 Nxc7 Kxc7 Kb5 Be5 Ka6 Kb8 Ka5 Bd6 Ka4 Ka7 Kb5 a3 Ka5 Kb7 Kb5 Bb4 Kc4 Kb6 Kb3 Kb5 Kc2 a4 Kb3 a5 Kc2 a6
31/75  12:33 3336652685 4428111  +6.28 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Nb6 c5 Nd5 c6 Kb1 Bf6 Kc2 Bg7 Kd3 Kb3 Nc7 a4 Ke3 a5 Ke4 Kc4 Na6 Bf6 Kf5 Bd4 Ke6 Kb5 Kd6 Kxa6 Kxc6 Ka7 Kd6 Bf6 Kd7 a6 Kc6 Bd8 Kb5 Bc7 Kc6 Bd6 Kd5 Ba3 Kc6 Bb2 Kc5 Ba1 Kc6 Be5 Kd5 Bf4 Kc6 Bc1 Kc7 Ba3 Kc6
32/75  13:07 3472075563 4406388  +6.28 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Nb6 c5 Nd5 c6 Kb1 Bd4 Kc2 Bg7 Kd2 Kb3 Kd3 Ba1 Nc7 a4 Na8 a5 Ke4 Kc4 Kf5 a6 Ke6 Kb5 Ke7 a7 Kd8 Bd4 Nc7+ Kc5 Na8 Bc3 Kc8 Be5 Kd8 Bf4 Kc8 Kb5 Kd8 Bg3 Kc8 Bd6 Kd8 Bg3
33/75+ 16:23 4391954532 4466586  +6.67 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Nb6 c5 Nd5 c6 Kb1 Bd4 Kc2 Bg7 Kd3 Kb3 Nc7 Bf6 Ke4 Kc4 Ne8 Ba1 Nc7 a4 Kf5 Kc5 Ke6 a5 Na8 a6 Ke7 a7 Kd8 Bc3 Nc7 Be5 Na8 Bf4 Nc7 Bg5+ Kc8 Bf6 Na8 Kb5 Kc7 Be5+ Kc8 Bf6
33/75  19:54 5381447873 4504110  +6.67 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Nb6 c5 Nd5 c6 Kb1 Bd4 Kc2 Bg7 Kd3 Kb3 Nc7 Bf6 Ne8 Ba1 Nc7 a3 Na8 Bf6 Ke4 Kc4 Nb6+ Kc5 Nc8 Ba1 Kf5 a4 Ke6 a5 Na7 Bd4 Ke7 Be5 Ke6 Ba1 Nc8 a6 Na7 Bb2 Nc8 Bd4 Ke7 c7 Kd7 Be5 Ke6 Bg3 Na7 Kb6 Nc8+ Kb7 Kd7 a7 Nxa7 Kxa7 Kc8 Bd6 Kd7 Be5 Kc8 Kb6 Kd7 Ka7
34/76+ 24:49 6911490815 4639596  +7.09 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Nb6 c5 Nd5 c6 Kb1 Bd4 Kc2 Bg7 Kd2 Kb3 Kd3 Ba1 Ke3 a3 Ne7 c7 Ke4 Kc4 Nd5 c8=N Ne3+ Kc5 Nc2 Nd6+ Ke3 Bb2 Ne1 Kb5 Nd3 Ba1 Kf3 Bd4 Kg4 a4 Nf4 a5 Nd5 Bg1 Kf3 a6 Nc7+ Kb6 Nxa6 Kxa6 Kf4 Bb6 Ke5 Nb5 Ke4 Nc3+ Kd3 Nd5 Ke4 Nf6+ Kf3
34/80+ 31:44 9229841959 4845112  +7.50 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Nb6 c5 Nd5 c6 Kb1 Bd4 Kc2 Bg7 Kd2 Kb3 Kd3 Bb2 Ke4 Kc4 Ne7 c7 Nd5 c8=N Ne3+ Kb5 Kd3 a4 Nc4 Ba1 Na3+ Kc5 Nc4 Bf6 Na5 Kb4 Nb7 Kb5 Kc2 Kb6 Kb3 Kxb7 Kxa4 Nd6 Kb4 Kb6 Kb3 Ka7 Kb4 Bd4 Kb3 Kb7 Kc2 Kb8 Kd3
34/80+ 41:10 12555095869 5081164  +8.12 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Nc5+ Ka3 Kc2 Be5 Nd7 Ba1 Nb6 c5 Nd5 c6 Kb1 Bd4 Kc2 Bg7 Kd2 Kb3 Kd3 Bb2 Ke4 Kc4 Ne7 c7 Nd5 c8=N Ne3+ Kb5 Nd5 a4 Ke3 a5 Kf3 Nd6 Ke2 Ba1 Nc7+ Kc6 Na6 Be5 Kd1 Kb5 Nc7+ Kc4 Kc2 Nf7 Na8 Kb5 Kd3 a6 Ke4 Kc6 Kf5 Kb7 Ke4 Kxa8 Ke3 Ka7 Ke4 Kb7 Kf5 Ba1
34/92  56:46 18261356097 5360039  +9.04 Bb2 Nd2 c4 Nxc4+ Kb4 Nd6 Kb3 Nb7 c4 Na5+ Kb4 Nxc4 a4 Nd6 Kc5 Nb7+ Kb6 Nd6 Be5 Nc4+ Kb5 Nxe5 a5 Ka1 a6 Kb2 a7 Kc3 a8=Q Kd4 Qg2 Nd3 Kc6 Ke3 Kd6 Nf4 Qg3+ Ke4 Qb3 Nd3 Qe6+ Kf3 Qf5+ Ke3 Qg6 Ne1 Qg1+ Ke2 Qh2+ Kd3 Qf2 Nc2 Kc5 Ne3 Qf3 Kd2 Kd4 Nc2+ Ke4 Kc1 Qf2 Kb1 Qb6+ Ka2 Kd5 Ka3 Kc5 Ka2 Qh6
35/92  57:48 18623267202 5368999  +9.04 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Nd1 a4 Nf2 Kb4 Ne4 c4 Kc2 c5 Kd3 a5 Kd4 a6 Nxc5 a7 Na6+ Ka5 Nc7 Kb6 Nd5+ Kb7 Ne3 a8=Q Nf5 Qg8 Ke5 Kb6 Ne3 Qd8 Kf4 Qe8 Nd5+ Kb7 Nf6 Qd8 Ke5 Qd1 Nd5 Kc6 Nf4 Qe1+ Kf5 Qg3 Ke4 Kd6 Nd3 Qg6+ Ke3 Qe8+ Kf3 Qf7+ Ke3 Qd5 Nf4 Qf5 Nd3 Qg6 Ne1 Qg1+ Ke2 Qh2+ Kd3 Qf2 Nc2 Kc5 Ne3 Qf3 Kd2 Kd4 Nc2+ Ke4 Kc1 Qf2 Kb1 Qb6+ Ka2 Kd5 Na3 Qf2+ Kb1 Qe1+ Kc2 Kd4
36/92  60:31 19525841571 5376526  +9.04 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Nd1 a4 Nf2 Kb4 Ne4 c4 Kc2 c5 Kd3 a5 Kd4 a6 Nxc5 a7 Na6+ Ka5 Nc7 Kb6 Nd5+ Kb7 Ne3 a8=Q Nf5 Qg8 Ke5 Kb6 Ne3 Qd8 Kf4 Qe8 Nd5+ Kb7 Nf6 Qd8 Ke5 Qd1 Nd5 Kc6 Nf4 Qe1+ Kf5 Qg3 Ke4 Kd6 Nd3 Qg6+ Ke3 Qe8+ Kf3 Qf7+ Ke3 Qd5 Nf4 Qf5 Nd3 Qg6 Ne1 Qg1+ Ke2 Qh2+ Kd3 Qf2 Nc2 Kc5 Ne3 Qf3 Kd2 Kd4 Nc2+ Ke4 Kc1 Qf2 Kd1 Qg1+ Kd2 Qc5 Kd1 Qc3 Ne1 Qe3 Nc2 Qg1+
37/92  64:15 20824601542 5401422  +9.04 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Nd1 a4 Nf2 Kb4 Ne4 c4 Kd2 c5 Kd3 a5 Kd4 a6 Nxc5 a7 Na6+ Ka5 Nc7 Kb6 Nd5+ Kb7 Ne3 a8=Q Nf5 Qg8 Ke5 Kb6 Ne3 Qd8 Kf4 Qe8 Nd5+ Kb7 Nf6 Qd8 Ke5 Qd1 Nd5 Kc6 Nf4 Qe1+ Kf5 Qe3 Ng6 Kd6 Kf6 Qb3 Kf5 Qf7+ Kg5 Kd5 Nh4 Qg7+ Kf4 Qe5+ Kf3 Qh5+ Kg3 Qg5+ Kh3 Ke4 Ng2 Qf5+ Kg3 Qf6 Ne1 Qa1 Ng2 Qc3+ Kh2 Qe5+ Kh3 Qg7 Nh4 Qd4 Ng2 Qf2 Nh4 Qe2 Ng2 Qf3+ Kh2 Qg4 Kh1 Qh3+ Kg1 Qf5 Ne1 Qg5+ Kf2 Qe5 Ng2 Qf5+
38/92+ 92:02 32737243436 5927873  +9.60 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Nd1 a4 Nf2 Kb4 Ne4 c4 Kd2 c5 Kd3 a5 Kd4 a6 Nxc5 a7 Na6+ Ka5 Nc7 Kb6 Nd5+ Kb7 Ne3 a8=Q Nf5 Qg8 Ke5 Kb6 Ne3 Qd8 Kf4 Qe8 Nd5+ Kb7 Nf6 Qd8 Ke5 Qd1 Nd5 Kc6 Nf4 Qe1+ Kf5 Qe3 Ng6 Kd6 Kf6 Qb3 Kf5 Qf7+ Kg5 Kd5 Nh4 Qe7+ Kg4 Qg7+ Kf3 Qe5 Ng2 Kd4 Kg4 Ke4 Nh4 Qh2 Ng6 Qd2 Nh4 Qh6 Ng2 Qf6 Nh4 Qd4 Ng6 Qg1+ Kh5 Qg3 Kh6 Qe3+ Kg7 Qg5 Kf7 Qc5 Kg7 Qc3+ Kf7 Qf3+ Kg7 Qb3 Ne7 Qa2 Kf6 Qc4 Kg7 Qd4+
38/102+ 140:46 56364635106 6673319 +10.17 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Nd1 a4 Nf2 Kb4 Ne4 c4 Kd2 c5 Kd3 a5 Kd4 a6 Nxc5 a7 Na6+ Ka5 Nc7 Kb6 Nd5+ Kb7 Ne3 a8=Q Nf5 Qg8 Ke5 Kb6 Ne3 Qd8 Ke4 Kc6 Kf3 Qf6+ Ke4 Qe6+ Kd4 Qd7+ Ke4 Qd2 Kf4 Qb4+ Kf3 Qe1 Ng2 Qf1+ Kg3 Kc5 Ne3 Qb5 Kf2 Kd4 Nf1 Qd7 Kg2 Qd5+ Kf2 Qf7+ Kg2 Qc4 Kf2 Qa2+ Kf3 Qd5+ Kf2
38/109+ 272:07 129390070994 7924616 +11.01 Bb2 Nd2 c4 Nxc4+ Kb4 Nxb2 Kb3 Kc1 a3 Nd1 a4 Nf2 Kb4 Ne4 c4 Kd2 c5 Kd3 a5 Kd4 a6 Nxc5 a7 Na6+ Ka5 Nc7 Kb6 Nd5+ Kb7 Ne3 a8=Q Nf5 Qg8 Ke5 Kb6 Ne3 Qd8 Ke4 Qh4+ Ke5 Kc5 Nf5 Qc4 Kf6 Qd5 Kg6 Qe5 Ng7 Kd5 Kf7 Qc7+ Kg6 Qd6+ Kg5 Ke5 Nh5 Qd4 Kh6 Qg1 Kh7 Ke4 Ng7 Ke5 Ne8 Ke6 Kh6 Qh2+ Kg6 Qg3+ Kh7 Qf2 Kh6 Qh2+

[ZirconiumX]

FruitFly (with REBEL lazy eval as a new addition) finds the move Bb2 easily - score at 0 though.

Score : 0.00
Depth : 11/1
Time : 00:00:00
Nodes : 461
N/sec : 1844
1. Bb2 Nd2 2. Ka4 Kxb2 3. c4 Nxc4 4. Kb4 Nd2 5. Ka4 Kxa2

Sorry - I hate showing off.

Even at depth 27 it rates the position as +0.27 (Fruit is a pessimistic engine).

Matthew:out

[pichy]

run freezer or finalgen on it.

Not even Freezer nor Finalgen can solve this one, since most engines will play the normal Rf6 which is not the best move,Tarrach playing Vs Thorold in Manchester 1890 found Pd6+ as the best move and if the Black Rook take the pawn then Rf7+ and after both Kings take each other Rooks White picks off the Queen side pawns winning easily!

[d]3r4/4k3/pp4p1/3PK2p/PP6/5R1P/6P1/8 w - - 0 1

[ernest]

most engines will play the normal Rf6

Houdini 2.0c, depth 23

Code: Select all

Analysis by Houdini 2.0c w32 Nalimov:
1. +-  (6.77): 1.d6+ Kd7 2.Rf7+ Kc8 3.Rc7+ Kb8 4.Kd5 Rf8 5.Rg7 g5 6.Rxg5 a5 7.b5 h4 8.Kc6 Rf6 9.Rg8+ Ka7 10.Rh8 Rg6 11.Rxh4 Rg8 12.Rh7+ Ka8 13.Kxb6 Rb8+ 14.Kxa5 Rd8 15.d7 Kb7 16.g4 Kc7 17.Kb4 Rg8 18.a5 Kd8 19.a6 Kc7 20.a7 Kb6 21.Re7 Rf8 22.g5 Rh8 23.Kc4 
2. +-  (5.40): 1.Rf6 Rg8 2.Rxb6 Rc8 3.Rxa6 Rc2 4.Rxg6 Re2+ 5.Kd4 Kf7 6.Rh6 Rd2+ 7.Ke5 Rxg2 8.a5 Re2+ 9.Kd6 Ra2 10.Kc5 Kg7 11.Rxh5 Kf7 12.Rh6 Kg7 13.Re6 Rc2+ 14.Kb6 Rd2 15.a6 Rxd5 16.a7 Rd8 17.Kc7 Rf8 18.b5 Kf7 19.Rc6 
3. +-  (2.39): 1.Rc3 Re8 2.Rc7+ Kd8+ 3.Kd6 Rf8 4.Rb7 Rf6+ 5.Ke5 Rf5+ 6.Ke6 Rf2 7.Rxb6 Kc7 8.Rxa6 Re2+ 9.Kf6 Rd2 10.Rc6+ Kd7 11.b5 Rxd5 12.Kxg6 Rd2 13.g3 Rd3 14.h4 Rxg3+ 15.Kxh5 Ra3 16.Rc4 Kd6 17.b6 Rb3 18.Rg4 Kc6 19.a5 

[pichy]

most engines will play the normal Rf6

Why are you using Nalimov? Remember the engine is suppose to solve it, and by using tablebase you are preventing the engine from finding the correct move by itself.


Houdini 2.0c, depth 23

Code: Select all

Analysis by Houdini 2.0c w32 Nalimov:
1. +-  (6.77): 1.d6+ Kd7 2.Rf7+ Kc8 3.Rc7+ Kb8 4.Kd5 Rf8 5.Rg7 g5 6.Rxg5 a5 7.b5 h4 8.Kc6 Rf6 9.Rg8+ Ka7 10.Rh8 Rg6 11.Rxh4 Rg8 12.Rh7+ Ka8 13.Kxb6 Rb8+ 14.Kxa5 Rd8 15.d7 Kb7 16.g4 Kc7 17.Kb4 Rg8 18.a5 Kd8 19.a6 Kc7 20.a7 Kb6 21.Re7 Rf8 22.g5 Rh8 23.Kc4 
2. +-  (5.40): 1.Rf6 Rg8 2.Rxb6 Rc8 3.Rxa6 Rc2 4.Rxg6 Re2+ 5.Kd4 Kf7 6.Rh6 Rd2+ 7.Ke5 Rxg2 8.a5 Re2+ 9.Kd6 Ra2 10.Kc5 Kg7 11.Rxh5 Kf7 12.Rh6 Kg7 13.Re6 Rc2+ 14.Kb6 Rd2 15.a6 Rxd5 16.a7 Rd8 17.Kc7 Rf8 18.b5 Kf7 19.Rc6 
3. +-  (2.39): 1.Rc3 Re8 2.Rc7+ Kd8+ 3.Kd6 Rf8 4.Rb7 Rf6+ 5.Ke5 Rf5+ 6.Ke6 Rf2 7.Rxb6 Kc7 8.Rxa6 Re2+ 9.Kf6 Rd2 10.Rc6+ Kd7 11.b5 Rxd5 12.Kxg6 Rd2 13.g3 Rd3 14.h4 Rxg3+ 15.Kxh5 Ra3 16.Rc4 Kd6 17.b6 Rb3 18.Rg4 Kc6 19.a5 

[zullil]

most engines will play the normal Rf6 which is not the best move

[d]3r4/4k3/pp4p1/3PK2p/PP6/5R1P/6P1/8 w - - 0 1

Does Rf6 still win?

[pichy]

most engines will play the normal Rf6 which is not the best move

[d]3r4/4k3/pp4p1/3PK2p/PP6/5R1P/6P1/8 w - - 0 1

Does Rf6 still win?

This is the evaluation after Pd6!

Rf6!? also win, but it is not the fastest way of winning since it is much easier to win by forcing the rooks out of the game, otherwise Tarrach would had selected. I am certain that Tarrach saw Rf6 too. In the old days my father used to say to me that there were two ways of getting from his house to my grandma house, either by taking his Horse or by taking his donkey, but he always took his Horse and arrived much faster

FEN: 3r4/4k3/pp1P2p1/4K2p/PP6/5R1P/6P1/8 b - - 0 1

FEN: 3r4/4k3/pp1P2p1/4K2p/PP6/5R1P/6P1/8 b - - 0 1

Houdini_15_w32:
4/8 00:00 279 0 -0.07 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6d5
5/11 00:00 554 0 -0.10 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6c6 a6a5
6/13 00:00 1.964 122.000 -0.04 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6d5 Kf6f5 h3h4
7/13 00:00 2.563 160.000 -0.08 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6d5 Kf6f5 g2g3 g6g5
8/15 00:00 5.727 357.000 -0.94 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 a6a5 b4xa5 b6xa5 Kd6c6 Kf7e6 Kc6b6 Ke6d5 Kb6xa5
9/15 00:00 9.378 586.000 -1.03 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d5 g2g4 h5xg4 h3xg4
10/16 00:00 11.238 702.000 -1.10 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e7 Kc6xb5 Ke7d6 g2g4 Kd6d5 g4xh5 g6xh5
11/17- 00:00 13.826 864.000 -1.18 Rd8xd6 Rf3f7+
11/17- 00:00 16.979 547.000 -1.35 Rd8xd6 Rf3f7+
11/19 00:00 19.363 605.000 -1.54 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d5 Kb5b6 h5h4 b4b5 g6g5
12/19- 00:00 23.855 722.000 -1.63 Rd8xd6 Rf3f7+
12/21- 00:00 29.359 838.000 -1.80 Rd8xd6 Rf3f7+
12/33 00:00 66.734 1.334.000 -2.11 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d7 Kb5b6 Kd7c8 b4b5 Kc8b8 h3h4
13/33- 00:00 135.554 1.737.000 -2.21 Rd8xd6 Rf3f7+
13/33 00:00 151.318 1.801.000 -2.19 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e7 Kc6xb5 g6g5 Kb5c6 Ke7d8 b4b5 Kd8c8 b5b6 h5h4 Kc6d5
14/33- 00:00 157.732 1.855.000 -2.30 Rd8xd6 Rf3f7+
14/33- 00:00 203.019 1.637.000 -2.53 Rd8xd6 Rf3f7+
14/33- 00:00 453.309 1.306.000 -4.54 Rd8xd6 Rf3f7+
14/47 00:00 997.652 1.781.000 -5.26 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6c6 Kf6e6 Kc6xb6 Ke6d7 Kb6xa6 Kd7c8 b4b5 Kc8b8 Ka6b6 g6g5 a4a5 g5g4 a5a6 g4g3
14/47 00:00 1.259.637 1.894.000 -4.40 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 a6a5 b4xa5 Rf6f7 a5a6 Rf7a7 h3h4 Ra7f7 Rb6b7 Rf7f6 Rb7e7 Kc8b8 a6a7+ Kb8a8
15/47- 00:00 1.313.020 1.894.000 -4.58 Ke7d7 Rf3f7+
15/47- 00:00 1.415.081 1.925.000 -4.93 Ke7d7 Rf3f7+
15/47 00:00 1.793.130 2.063.000 -5.28 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 Rf6e6 Rb6xa6 Kc8b8 b4b5 g6g5 b5b6 Re6e2 Ra6a5 Re2c2+ Ra5c5 Rc2f2 d6d7 Rf2f6+ Kc6b5 Rf6f8 Rc5xg5 Rf8d8 Rg5g7
15/47+ 00:00 1.805.753 2.056.000 -4.21 Rd8xd6
15/47+ 00:00 1.817.934 2.049.000 -3.80 Rd8xd6
15/47- 00:00 1.827.335 2.043.000 -5.90 Rd8xd6 Rf3f7+
15/47 00:01 1.831.157 2.039.000 -5.28 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 Rf6e6 Rb6xa6 Kc8b8 b4b5 g6g5 b5b6 Re6e2 Ra6a5 Re2c2+ Ra5c5 Rc2f2 d6d7 Rf2f6+ Kc6b5 Rf6f8 Rc5xg5 Rf8d8 Rg5g7
16/47- 00:01 2.272.323 2.141.000 -5.49 Ke7d7 Rf3f7+
16/47 00:01 2.711.848 2.233.000 -5.64 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 a6a5 b4xa5 Rf6f7 a5a6 g6g5 Rb6b7 Rf7f6 Rb7b5 Rf6f7 Rb5xg5 Kc8b8 Rg5xh5 Rf7f8 d6d7 Rf8f6+ Kc6d5 Kb8c7 a6a7 Rf6f8 Rh5h6
17/47- 00:01 3.448.687 2.333.000 -5.87 Ke7d7 Rf3f7+
17/47 00:01 4.373.318 2.429.000 -6.26 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 a6a5 b4xa5 Rf6f7 a5a6 g6g5 Rb6b7 Rf7f6 Rb7b5 Rf6f7 Rb5xg5 Kc8b8 Rg5xh5 Rf7f8 Rh5h7 Rf8c8+ Rh7c7 Rc8f8 Rc7b7+ Kb8a8 d6d7 Rf8d8 Kc6c7
18/48 00:02 5.954.218 2.556.000 -6.50 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 h5h4 Qd8xh4 Rb7b6+ Kc6c5 Rb6b7 Qh4e4 g6g5 Qe4d5 Rb7c7+ Kc5d6 Rc7b7 Qd5xg5 Rb7b6+ Kd6c5
19/53- 00:03 8.820.246 2.682.000 -6.77 Ke7d7 Rf3f7+
19/54- 00:04 13.179.282 2.804.000 -7.31 Ke7d7 Rf3f7+
19/63 00:05 16.818.320 2.857.000 -7.45 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 Rb7b1 Qd8d7+ Ka7a8 Qd7e8+ Rb1b8 Qe8xg6 h5h4 Qg6e4 Ka8a7 Qe4d4+ Ka7a8 Qd4xh4 Rb8c8+ Kc6b6 Rc8e8 Kb6xa6 Re8e6+ Ka6b5 Re6e5+ Kb5b6 Re5e6+ Kb6a5 Ka8b7 Qh4b4+ Kb7c7 Qb4c4+ Re6c6 Qc4f7+ Kc7d6
20/68 00:08 24.443.329 2.967.000 -7.68 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 h5h4 Qd8xh4 Rb7b6+ Kc6c5 Rb6b7 Qh4e4 g6g5 Qe4d5 Rb7g7 Kc5c6 Rg7b7 Qd5xg5 Rb7b6+ Kc6c5 a6a5 Qg5d8 Rb6b3 Qd8xa5+ Ka7b7 Qa5d8 Rb3e3 Qd8d7+ Kb7b8 Qd7d6+ Kb8c8 h3h4 Re3c3+ Kc5b5
21/68 00:10 30.625.428 2.977.000 -7.80 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 h5h4 Qd8xh4 Rb7b6+ Kc6c5 Rb6b7 Qh4e4 g6g5 Qe4d5 Rb7g7 Kc5c6 Rg7b7 Qd5xg5 Rb7b6+ Kc6c5 Rb6b7 h3h4 Rb7f7 h4h5 Rf7c7+ Kc5d4 Rc7d7+ Kd4e4
21/68 00:10 30.989.579 2.983.000 -7.68 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 g6g5 Kd6c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf7e6 Kb5c6 Ke6f5 b4b5 Kf5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2e1+ Kh4h3 Qe1h1+ Kh3g4 Qh1g1+ Kg4f4 Qg1c1+ Kf4f5 Qc1f1+ Kf5g6 Qf1d3+ Kg6f6 Qd3d4+
22/68 00:10 31.689.648 2.989.000 -7.68 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 g6g5 Kd6c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf7e6 Kb5c6 Ke6f5 b4b5 Kf5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2e1+ Kh4h3 Qe1h1+ Kh3g4 Qh1g1+ Kg4f4 Qg1d4+ Kf4f5 Qd4d3+ Kf5f6 Qd3f3+ Kf6g6 Kc6d6
23/68 00:12 35.744.789 2.993.000 -7.68 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 g6g5 Kd6c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf7e6 Kb5c6 Ke6f5 b4b5 Kf5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2e1+ Kh4h3 Qe1h1+ Kh3g4 Qh1g1+ Kg4h4 Qg1h2+ Kh4g4 Qh2g2+ Kg4f4 Qg2f1+ Kf4g3 Qf1d3+ Kg3f4 Qd3d4+ Kf4f5 Qd4d3+ Kf5f6 Qd3f3+ Kf6g6 Kc6d6
24/71 00:13 40.596.057 3.006.000 -7.68 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 g6g5 Kd6c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf7e6 Kb5c6 Ke6f5 b4b5 Kf5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2e1+ Kh4h3 Qe1h1+ Kh3g4 Qh1g1+ Kg4h4 Qg1h2+ Kh4g4 Qh2g2+ Kg4f4 Qg2f1+ Kf4g3 Qf1b5 Kg3g4 Qb5c4+ Kg4f5 Qc4d3+ Kf5f4 Qd3d4+ Kf4f5 Qd4d3+ Kf5f4
25/71- 00:15 47.286.816 2.987.000 -7.99 Rd8xd6 Rf3f7+
25/71- 00:25 76.600.463 3.001.000 -8.63 Rd8xd6 Rf3f7+
25/71- 00:38 119.794.837 3.101.000 -10.42 Rd8xd6 Rf3f7+
25/71 01:01 203.557.347 3.339.000 -10.59 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d6 h3h4 Kd6d7 Kb5b6 Kd7e6 b4b5 Ke6f5 Kb6c6 Kf5g4 b5b6 Kg4xh4 b6b7 Kh4g5 b7b8Q Kg5f6 Qb8d6+ Kf6f7 Qd6e5 Kf7g8 Qe5f6 Kg8h7 Qf6f8 h5h4
26/71 01:14 250.404.623 3.356.000 -10.71 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d6 h3h4 Kd6d7 Kb5b6 Kd7e6 b4b5 Ke6f5 Kb6c6 Kf5g4 b5b6 Kg4xh4 b6b7 Kh4g5 b7b8Q h5h4 Qb8e5+ Kg5g4 Qe5e4+ Kg4g5 Qe4f3 Kg5h6 Qf3f4+ g6g5 Qf4f6+ Kh6h7 Qf6xg5
27/71 01:30 305.844.709 3.368.000 -10.82 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d6 h3h4 Kd6d7 Kb5b6 Kd7e6 b4b5 Ke6f5 Kb6c6 Kf5g4 b5b6 Kg4xh4 b6b7 Kh4g3 b7b8Q+ Kg3xg2 Qb8f4 h5h4 Qf4xh4 Kg2f3 Qh4f6+ Kf3e2 Qf6xg6 Ke2e3 Kc6c5 Ke3f2 Qg6h5 Kf2e1 Kc5c6 Ke1d2 Kc6d5 Kd2c2 Qh5e2+ Kc2b3 Qe2d3+ Kb3b2
28/71 01:54 392.709.451 3.421.000 -10.81 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d6 h3h4 Kd6d7 Kb5b6 Kd7e6 b4b5 Ke6f5 Kb6c6 Kf5g4 b5b6 Kg4xh4 b6b7 Kh4g3 b7b8Q+ Kg3xg2 Qb8f4 h5h4 Qf4xh4 Kg2f3 Qh4f6+ Kf3e4 Qf6xg6+ Ke4f3 Qg6e6 Kf3g3 Qe6b3+ Kg3f2 Qb3d3 Kf2e1 Qd3d4 Ke1f1
29/71 02:20 482.336.532 3.446.000 -10.82 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d6 h3h4 Kd6d7 Kb5b6 Kd7e6 b4b5 Ke6f5 Kb6c6 Kf5g4 b5b6 Kg4xh4 b6b7 Kh4g5 b7b8Q Kg5f5 Qb8f8+ Kf5g5 Qf8d8+ Kg5f5 Kc6d5 g6g5 Qd8e8 Kf5g4 Qe8e4+ Kg4g3 Qe4f3+ Kg3h2 Qf3xh5+ Kh2xg2 Qh5g4+ Kg2f1 Qg4xg5 Kf1f2 Qg5e5 Kf2f1
30/71- 03:01 620.921.430 3.415.000 -11.27 Rd8xd6 Rf3f7+



=============================================================================================================

And this is the evaluation after Rf6!?


FEN: 3r4/4k3/pp1P2p1/4K2p/PP6/5R1P/6P1/8 b - - 0 1

Houdini_15_w32:
4/8 00:00 279 0 -0.07 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6d5
5/11 00:00 554 0 -0.10 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6c6 a6a5
6/13 00:00 1.965 122.000 -0.04 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6d5 Kf6f5 h3h4
7/13 00:00 2.615 163.000 -0.08 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6d5 Kf6f5 g2g3 g6g5
8/15 00:00 5.517 344.000 -0.94 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 a6a5 b4xa5 b6xa5 Kd6c6 Kf7e6 Kc6b6 Ke6d5 Kb6xa5
9/15 00:00 9.054 282.000 -1.03 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d5 g2g4 h5xg4 h3xg4
10/16 00:00 11.275 281.000 -1.10 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e7 Kc6xb5 Ke7d6 g2g4 Kd6d5 g4xh5 g6xh5
11/17- 00:00 13.389 291.000 -1.18 Rd8xd6 Rf3f7+
11/17- 00:00 16.479 323.000 -1.35 Rd8xd6 Rf3f7+
11/19 00:00 18.819 336.000 -1.54 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d5 Kb5b6 h5h4 b4b5 g6g5
12/19- 00:00 22.087 339.000 -1.63 Rd8xd6 Rf3f7+
12/20- 00:00 28.054 389.000 -1.80 Rd8xd6 Rf3f7+
12/22 00:00 37.693 471.000 -2.11 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d7 Kb5b6 Kd7c8 b4b5 Kc8b8 g2g4
13/26- 00:00 82.181 782.000 -2.21 Rd8xd6 Rf3f7+
13/27 00:00 135.422 1.018.000 -2.25 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d7 Kb5b6 Kd7c8 b4b5 Kc8b8 g2g4 h5xg4 h3xg4
14/28- 00:00 169.468 1.129.000 -2.36 Rd8xd6 Rf3f7+
14/33 00:00 279.791 1.391.000 -2.39 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d7 Kb5b6 Kd7c8 b4b5 Kc8b8 Kb6c6 g6g5 b5b6 h5h4
15/33- 00:00 369.267 1.538.000 -2.51 Rd8xd6 Rf3f7+
15/36- 00:00 518.593 1.689.000 -2.74 Rd8xd6 Rf3f7+
15/46- 00:00 737.040 1.875.000 -3.32 Rd8xd6 Rf3f7+
15/46 00:00 1.106.027 2.067.000 -2.92 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5e6 Rd8e8+ Ke6d5 Re8e2 Kd5c6 Re2c2+ Kc6xb6 Rc2b2 Rc7b7+ Kb8c8 Kb6xa6 Rb2xg2 d6d7+ Kc8d8 a4a5 g6g5 Ka6b6 g5g4 a5a6 g4xh3 a6a7 Rg2a2 Kb6c6 Ra2c2+ Kc6b5 Rc2a2 Rb7b8+ Kd8xd7 a7a8Q Ra2xa8 Rb8xa8
16/46- 00:00 1.429.192 2.152.000 -3.06 Ke7d7 Rf3f7+
16/46 00:00 1.807.188 2.239.000 -3.32 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5e6 Rd8e8+ Ke6d5 Re8e2 Kd5c6 Re2c2+ Kc6xb6 Rc2d2 Rc7c6 a6a5 Kb6xa5 Kb8b7 b4b5 h5h4 Ka5b4 Rd2d4+ Kb4c5 Rd4xa4 d6d7 Ra4a8 Rc6xg6 Kb7c7 Rg6a6 Ra8b8 Ra6a7+ Kc7d8 b5b6
17/46- 00:01 2.454.834 2.346.000 -3.48 Ke7d7 Rf3f7+
17/46- 00:01 2.842.542 2.382.000 -3.80 Ke7d7 Rf3f7+
17/46- 00:01 3.844.566 2.466.000 -4.59 Ke7d7 Rf3f7+
17/48 00:02 5.670.001 2.585.000 -5.65 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8a8 Rb7xb6 Ka8a7 Rb6b7+ Ka7a8 Rb7g7 Rf6f8 Kc6c7 Rf8b8 d6d7 Rb8b7+ Kc7d6 Rb7b8 Kd6e7 Rb8b7 Rg7xg6 Ka8b8 Rg6xa6 h5h4 b4b5
17/48+ 00:02 5.688.684 2.582.000 -3.16 Rd8xd6
17/48- 00:02 5.737.578 2.582.000 -6.69 Rd8xd6 Rf3f7+
17/48 00:02 6.303.212 2.604.000 -6.13 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 Rf6f7 Rb6xa6 Kc8b8 b4b5 h5h4 d6d7 Rf7f6+ Kc6c5 Rf6f8 Ra6f6 Rf8d8 Kc5c6 Rd8g8 b5b6 Rg8h8 Rf6xg6 Rh8d8 Rg6h6 Rd8f8 Rh6xh4 Rf8f6+ Kc6c5 Rf6f5+ Kc5d6 Rf5f6+ Kd6e7
18/48- 00:02 7.249.085 2.634.000 -6.39 Ke7d7 Rf3f7+
18/48 00:03 7.678.118 2.644.000 -6.37 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8a8 Rb7xb6 Ka8a7 Rb6b7+ Ka7a8 Rb7g7 Rf6f8 Kc6c7 Rf8b8 d6d7 Rb8b7+ Kc7d6 Rb7b8 Kd6e7 a6a5 d7d8Q Rb8xd8 Ke7xd8 a5xb4 Rg7xg6 Ka8a7 Kd8c7 h5h4 Rg6b6
19/48- 00:03 8.488.298 2.664.000 -6.64 Ke7d7 Rf3f7+
19/54 00:04 11.578.881 2.750.000 -6.92 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 Rb7b8 Qd8e7+ Ka7a8 Qe7d7 h5h4 Qd7e7 Rb8b2 Qe7xh4 Rb2b7 Qh4h8+ Ka8a7 Qh8d8 g6g5 Qd8xg5 Rb7b6+ Kc6c5 Rb6b7 h3h4 Rb7c7+ Kc5d4
20/63 00:05 13.901.970 2.789.000 -7.02 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 h5h4 Qd8d4+ Ka7b8 Qd4f4+ Kb8a7 Qf4f2+ Ka7b8 Qf2xh4 Kb8a8 Qh4h8+ Ka8a7 Qh8d8 g6g5 Qd8xg5 Rb7b6+ Kc6c5 Rb6b7 Qg5d5 Rb7h7 h3h4 Rh7c7+ Kc5b4 Ka7b8 h4h5
21/64 00:05 16.072.078 2.808.000 -7.14 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 h5h4 Qd8d4+ Ka7b8 Qd4f4+ Kb8a7 Qf4f2+ Ka7b8 Qf2xh4 Kb8a7 Qh4d4+ Ka7a8 Qd4h8+ Ka8a7 Qh8d8 g6g5 Qd8xg5 Rb7b6+ Kc6d7 Rb6b7+ Kd7d6 Rb7b6+ Kd6c5 Rb6b7 Qg5d5 Rb7c7+ Kc5d6 Rc7c8 h3h4 Rc8d8+ Kd6e5 Rd8e8+ Ke5f5 Re8f8+ Kf5g6
22/64- 00:07 22.482.954 2.870.000 -7.44 Ke7d7 Rf3f7+
22/64- 00:11 33.183.648 2.914.000 -8.02 Ke7d7 Rf3f7+
22/64 00:11 33.734.626 2.925.000 -7.61 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 g6g5 Kb5c6 Ke6e5 b4b5 Ke5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e4+ Kg4g3 Qe4e3+ Kg3g4 Qe3e2+ Kg4h4 Qe2h2+ Kh4g4 Kc6d5 h5h4 Qh2g1+ Kg4f4 Qg1f2+ Kf4g4 Qf2e2+ Kg4g3 Qe2e5+ Kg3g4
23/64 00:12 35.728.746 2.933.000 -7.75 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 g6g5 Kb5c5 Ke6d7 Kc5b6 Kd7e6 b4b5 Ke6e5 Kb6c5 Ke5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2h2+ Kh4g4 Qh2g1+ Kg4f5 Qg1f1+ Kf5g6 Qf1d3+ Kg6f6 Qd3f3+ Kf6g6
24/64 00:14 42.055.199 2.949.000 -7.75 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 g6g5 Kb5c5 Ke6d7 Kc5b6 Kd7e6 b4b5 Ke6e5 Kb6c5 Ke5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2h2+ Kh4g4 Qh2g1+ Kg4f5 Qg1f1+ Kf5g6 Qf1d3+ Kg6f6 Qd3f3+ Kf6g6
25/64 00:16 49.488.501 2.953.000 -7.75 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 g6g5 Kb5c5 Ke6d7 Kc5b6 Kd7e6 b4b5 Ke6e5 Kb6c5 Ke5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2h2+ Kh4g4 Qh2g1+ Kg4f5 Qg1f1+ Kf5g6 Qf1d3+ Kg6f6 Qd3f3+ Kf6g6 Qf3e4+ Kg6h6
26/64 00:19 58.734.337 2.969.000 -7.75 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 g6g5 Kb5c5 Ke6d7 Kc5b6 Kd7e6 b4b5 Ke6e5 Kb6c5 Ke5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2h2+ Kh4g4 Qh2g1+ Kg4f5 Qg1f1+ Kf5g6 Qf1d3+ Kg6f6 Qd3f3+ Kf6g6
27/64- 00:25 75.350.849 3.003.000 -8.08 Rd8xd6 Rf3f7+
27/64- 00:36 111.387.382 3.024.000 -8.72 Rd8xd6 Rf3f7+
27/68- 01:09 211.647.961 3.069.000 -10.54 Rd8d6
27/69 02:18 446.810.116 3.235.000 -11.10 Rd8d6 Ke7f7 Ke5xd6+ g6g5 Kd6c6+ Kf7g6 Kc6xb6+ Kg6f5 Kb6xa6+ Kf5f4 a4a5+ Kf4g3 Ka6b6 Kg3xg2 a5a6 g5g4 h3xg4 h5xg4 b4b5 g4g3 a6a7 Kg2h2 a7a8Q g3g2 Qa8b8+ Kh2h1+ Qb8h8 Kh1g1 Qh8a1 Kg1f2 Qa1d4+ Kf2f3+ Kb6c5+ Kf3e2+ Qd4c4+ Ke2f2+ Qc4c2+ Kf2g3+ Qc2c3+ Kg3h2+ Qc3e5 Kh2h3 Qe5h5 Kh3g3 Qh5g6 Kg3h2 Qg6h5 Kh2g3 Qh5g6
28/70 03:23 664.647.147 3.271.000 -11.24 Rd8d6 Ke7f7 Ke5xd6+ g6g5 Kd6c6+ Kf7g6 Kc6xb6+ Kg6f5 Kb6xa6+ Kf5f4 a4a5+ Kf4g3 Ka6b6 Kg3xg2 a5a6 g5g4 h3xg4 h5xg4 b4b5 g4g3 a6a7 Kg2h2 a7a8Q g3g2 Qa8h8 Kh2g1 Qh8a1 Kg1f2 Qa1d4+ Kf2f1+ Qd4f4 Kf1e1 Qf4g3 Ke1f1 Qg3f3 Kf1g1 Qf3f8 Kg1h2 Qf8h8 Kh2g1

[pichy]

most engines will play the normal Rf6 which is not the best move

[d]3r4/4k3/pp4p1/3PK2p/PP6/5R1P/6P1/8 w - - 0 1

Does Rf6 still win?

Rf6!? also win, but it is not the fastest way of winning since it is much easier to win by forcing the rooks out of the game, otherwise Tarrach would had selected. I am certain that Tarrach saw Rf6 too. In the old days my father used to say to me that there were two ways of getting from his house to my grandma house, either by taking his Horse or by taking his donkey, but he always took his Horse and arrived much faster

This is the evaluation after Pd6!

[d]3r4/4k3/pp1P2p1/4K2p/PP6/5R1P/6P1/8 b - - 0 1

Houdini_15_w32:
4/8 00:00 279 0 -0.07 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6d5
5/11 00:00 554 0 -0.10 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6c6 a6a5
6/13 00:00 1.964 122.000 -0.04 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6d5 Kf6f5 h3h4
7/13 00:00 2.563 160.000 -0.08 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6d5 Kf6f5 g2g3 g6g5
8/15 00:00 5.727 357.000 -0.94 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 a6a5 b4xa5 b6xa5 Kd6c6 Kf7e6 Kc6b6 Ke6d5 Kb6xa5
9/15 00:00 9.378 586.000 -1.03 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d5 g2g4 h5xg4 h3xg4
10/16 00:00 11.238 702.000 -1.10 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e7 Kc6xb5 Ke7d6 g2g4 Kd6d5 g4xh5 g6xh5
11/17- 00:00 13.826 864.000 -1.18 Rd8xd6 Rf3f7+
11/17- 00:00 16.979 547.000 -1.35 Rd8xd6 Rf3f7+
11/19 00:00 19.363 605.000 -1.54 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d5 Kb5b6 h5h4 b4b5 g6g5
12/19- 00:00 23.855 722.000 -1.63 Rd8xd6 Rf3f7+
12/21- 00:00 29.359 838.000 -1.80 Rd8xd6 Rf3f7+
12/33 00:00 66.734 1.334.000 -2.11 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d7 Kb5b6 Kd7c8 b4b5 Kc8b8 h3h4
13/33- 00:00 135.554 1.737.000 -2.21 Rd8xd6 Rf3f7+
13/33 00:00 151.318 1.801.000 -2.19 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e7 Kc6xb5 g6g5 Kb5c6 Ke7d8 b4b5 Kd8c8 b5b6 h5h4 Kc6d5
14/33- 00:00 157.732 1.855.000 -2.30 Rd8xd6 Rf3f7+
14/33- 00:00 203.019 1.637.000 -2.53 Rd8xd6 Rf3f7+
14/33- 00:00 453.309 1.306.000 -4.54 Rd8xd6 Rf3f7+
14/47 00:00 997.652 1.781.000 -5.26 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 Kf7f6 Kd6c6 Kf6e6 Kc6xb6 Ke6d7 Kb6xa6 Kd7c8 b4b5 Kc8b8 Ka6b6 g6g5 a4a5 g5g4 a5a6 g4g3
14/47 00:00 1.259.637 1.894.000 -4.40 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 a6a5 b4xa5 Rf6f7 a5a6 Rf7a7 h3h4 Ra7f7 Rb6b7 Rf7f6 Rb7e7 Kc8b8 a6a7+ Kb8a8
15/47- 00:00 1.313.020 1.894.000 -4.58 Ke7d7 Rf3f7+
15/47- 00:00 1.415.081 1.925.000 -4.93 Ke7d7 Rf3f7+
15/47 00:00 1.793.130 2.063.000 -5.28 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 Rf6e6 Rb6xa6 Kc8b8 b4b5 g6g5 b5b6 Re6e2 Ra6a5 Re2c2+ Ra5c5 Rc2f2 d6d7 Rf2f6+ Kc6b5 Rf6f8 Rc5xg5 Rf8d8 Rg5g7
15/47+ 00:00 1.805.753 2.056.000 -4.21 Rd8xd6
15/47+ 00:00 1.817.934 2.049.000 -3.80 Rd8xd6
15/47- 00:00 1.827.335 2.043.000 -5.90 Rd8xd6 Rf3f7+
15/47 00:01 1.831.157 2.039.000 -5.28 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 Rf6e6 Rb6xa6 Kc8b8 b4b5 g6g5 b5b6 Re6e2 Ra6a5 Re2c2+ Ra5c5 Rc2f2 d6d7 Rf2f6+ Kc6b5 Rf6f8 Rc5xg5 Rf8d8 Rg5g7
16/47- 00:01 2.272.323 2.141.000 -5.49 Ke7d7 Rf3f7+
16/47 00:01 2.711.848 2.233.000 -5.64 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 a6a5 b4xa5 Rf6f7 a5a6 g6g5 Rb6b7 Rf7f6 Rb7b5 Rf6f7 Rb5xg5 Kc8b8 Rg5xh5 Rf7f8 d6d7 Rf8f6+ Kc6d5 Kb8c7 a6a7 Rf6f8 Rh5h6
17/47- 00:01 3.448.687 2.333.000 -5.87 Ke7d7 Rf3f7+
17/47 00:01 4.373.318 2.429.000 -6.26 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f6 Rc7b7+ Kb8c8 Rb7xb6 a6a5 b4xa5 Rf6f7 a5a6 g6g5 Rb6b7 Rf7f6 Rb7b5 Rf6f7 Rb5xg5 Kc8b8 Rg5xh5 Rf7f8 Rh5h7 Rf8c8+ Rh7c7 Rc8f8 Rc7b7+ Kb8a8 d6d7 Rf8d8 Kc6c7
18/48 00:02 5.954.218 2.556.000 -6.50 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 h5h4 Qd8xh4 Rb7b6+ Kc6c5 Rb6b7 Qh4e4 g6g5 Qe4d5 Rb7c7+ Kc5d6 Rc7b7 Qd5xg5 Rb7b6+ Kd6c5
19/53- 00:03 8.820.246 2.682.000 -6.77 Ke7d7 Rf3f7+
19/54- 00:04 13.179.282 2.804.000 -7.31 Ke7d7 Rf3f7+
19/63 00:05 16.818.320 2.857.000 -7.45 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 Rb7b1 Qd8d7+ Ka7a8 Qd7e8+ Rb1b8 Qe8xg6 h5h4 Qg6e4 Ka8a7 Qe4d4+ Ka7a8 Qd4xh4 Rb8c8+ Kc6b6 Rc8e8 Kb6xa6 Re8e6+ Ka6b5 Re6e5+ Kb5b6 Re5e6+ Kb6a5 Ka8b7 Qh4b4+ Kb7c7 Qb4c4+ Re6c6 Qc4f7+ Kc7d6
20/68 00:08 24.443.329 2.967.000 -7.68 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 h5h4 Qd8xh4 Rb7b6+ Kc6c5 Rb6b7 Qh4e4 g6g5 Qe4d5 Rb7g7 Kc5c6 Rg7b7 Qd5xg5 Rb7b6+ Kc6c5 a6a5 Qg5d8 Rb6b3 Qd8xa5+ Ka7b7 Qa5d8 Rb3e3 Qd8d7+ Kb7b8 Qd7d6+ Kb8c8 h3h4 Re3c3+ Kc5b5
21/68 00:10 30.625.428 2.977.000 -7.80 Ke7d7 Rf3f7+ Kd7c8 Rf7c7+ Kc8b8 Ke5d5 Rd8f8 Kd5c6 Rf8f4 Rc7b7+ Kb8a8 d6d7 Rf4c4+ Kc6xb6 Rc4xb4+ Kb6c5 Rb4xb7 d7d8Q+ Ka8a7 Kc5c6 h5h4 Qd8xh4 Rb7b6+ Kc6c5 Rb6b7 Qh4e4 g6g5 Qe4d5 Rb7g7 Kc5c6 Rg7b7 Qd5xg5 Rb7b6+ Kc6c5 Rb6b7 h3h4 Rb7f7 h4h5 Rf7c7+ Kc5d4 Rc7d7+ Kd4e4
21/68 00:10 30.989.579 2.983.000 -7.68 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 g6g5 Kd6c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf7e6 Kb5c6 Ke6f5 b4b5 Kf5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2e1+ Kh4h3 Qe1h1+ Kh3g4 Qh1g1+ Kg4f4 Qg1c1+ Kf4f5 Qc1f1+ Kf5g6 Qf1d3+ Kg6f6 Qd3d4+
22/68 00:10 31.689.648 2.989.000 -7.68 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 g6g5 Kd6c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf7e6 Kb5c6 Ke6f5 b4b5 Kf5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2e1+ Kh4h3 Qe1h1+ Kh3g4 Qh1g1+ Kg4f4 Qg1d4+ Kf4f5 Qd4d3+ Kf5f6 Qd3f3+ Kf6g6 Kc6d6
23/68 00:12 35.744.789 2.993.000 -7.68 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 g6g5 Kd6c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf7e6 Kb5c6 Ke6f5 b4b5 Kf5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2e1+ Kh4h3 Qe1h1+ Kh3g4 Qh1g1+ Kg4h4 Qg1h2+ Kh4g4 Qh2g2+ Kg4f4 Qg2f1+ Kf4g3 Qf1d3+ Kg3f4 Qd3d4+ Kf4f5 Qd4d3+ Kf5f6 Qd3f3+ Kf6g6 Kc6d6
24/71 00:13 40.596.057 3.006.000 -7.68 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 g6g5 Kd6c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf7e6 Kb5c6 Ke6f5 b4b5 Kf5f4 b5b6 Kf4g3 b6b7 Kg3xg2 b7b8Q Kg2xh3 Qb8e5 Kh3g4 Qe5e2+ Kg4h4 Qe2e1+ Kh4h3 Qe1h1+ Kh3g4 Qh1g1+ Kg4h4 Qg1h2+ Kh4g4 Qh2g2+ Kg4f4 Qg2f1+ Kf4g3 Qf1b5 Kg3g4 Qb5c4+ Kg4f5 Qc4d3+ Kf5f4 Qd3d4+ Kf4f5 Qd4d3+ Kf5f4
25/71- 00:15 47.286.816 2.987.000 -7.99 Rd8xd6 Rf3f7+
25/71- 00:25 76.600.463 3.001.000 -8.63 Rd8xd6 Rf3f7+
25/71- 00:38 119.794.837 3.101.000 -10.42 Rd8xd6 Rf3f7+
25/71 01:01 203.557.347 3.339.000 -10.59 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d6 h3h4 Kd6d7 Kb5b6 Kd7e6 b4b5 Ke6f5 Kb6c6 Kf5g4 b5b6 Kg4xh4 b6b7 Kh4g5 b7b8Q Kg5f6 Qb8d6+ Kf6f7 Qd6e5 Kf7g8 Qe5f6 Kg8h7 Qf6f8 h5h4
26/71 01:14 250.404.623 3.356.000 -10.71 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d6 h3h4 Kd6d7 Kb5b6 Kd7e6 b4b5 Ke6f5 Kb6c6 Kf5g4 b5b6 Kg4xh4 b6b7 Kh4g5 b7b8Q h5h4 Qb8e5+ Kg5g4 Qe5e4+ Kg4g5 Qe4f3 Kg5h6 Qf3f4+ g6g5 Qf4f6+ Kh6h7 Qf6xg5
27/71 01:30 305.844.709 3.368.000 -10.82 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d6 h3h4 Kd6d7 Kb5b6 Kd7e6 b4b5 Ke6f5 Kb6c6 Kf5g4 b5b6 Kg4xh4 b6b7 Kh4g3 b7b8Q+ Kg3xg2 Qb8f4 h5h4 Qf4xh4 Kg2f3 Qh4f6+ Kf3e2 Qf6xg6 Ke2e3 Kc6c5 Ke3f2 Qg6h5 Kf2e1 Kc5c6 Ke1d2 Kc6d5 Kd2c2 Qh5e2+ Kc2b3 Qe2d3+ Kb3b2
28/71 01:54 392.709.451 3.421.000 -10.81 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d6 h3h4 Kd6d7 Kb5b6 Kd7e6 b4b5 Ke6f5 Kb6c6 Kf5g4 b5b6 Kg4xh4 b6b7 Kh4g3 b7b8Q+ Kg3xg2 Qb8f4 h5h4 Qf4xh4 Kg2f3 Qh4f6+ Kf3e4 Qf6xg6+ Ke4f3 Qg6e6 Kf3g3 Qe6b3+ Kg3f2 Qb3d3 Kf2e1 Qd3d4 Ke1f1
29/71 02:20 482.336.532 3.446.000 -10.82 Rd8xd6 Rf3f7+ Ke7xf7 Ke5xd6 b6b5 a4xb5 a6xb5 Kd6c6 Kf7e6 Kc6xb5 Ke6d6 h3h4 Kd6d7 Kb5b6 Kd7e6 b4b5 Ke6f5 Kb6c6 Kf5g4 b5b6 Kg4xh4 b6b7 Kh4g5 b7b8Q Kg5f5 Qb8f8+ Kf5g5 Qf8d8+ Kg5f5 Kc6d5 g6g5 Qd8e8 Kf5g4 Qe8e4+ Kg4g3 Qe4f3+ Kg3h2 Qf3xh5+ Kh2xg2 Qh5g4+ Kg2f1 Qg4xg5 Kf1f2 Qg5e5 Kf2f1
30/71- 03:01 620.921.430 3.415.000 -11.27 Rd8xd6 Rf3f7+



=============================================================================================================


And this is the evaluation after Rf6!?

[d]3r4/4k3/pp3Rp1/3PK2p/PP6/7P/6P1/8 b - - 0 1

Houdini_15_w32:
4/11 00:00 1.333 0 -0.10 Rd8xd5+ Ke5xd5 Ke7xf6 h3h4 Kf6f5
5/11 00:00 1.733 0 -0.08 Rd8xd5+ Ke5xd5 Ke7xf6 b4b5 a6a5 h3h4
6/12 00:00 2.353 0 -1.19 Rd8xd5+ Ke5xd5 Ke7xf6 Kd5c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf6e5
7/12 00:00 3.112 0 -1.17 Rd8xd5+ Ke5xd5 Ke7xf6 Kd5c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf6e5 Kb5c5
8/13 00:00 3.972 0 -1.20 Rd8xd5+ Ke5xd5 Ke7xf6 Kd5c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf6e5 Kb5c5 Ke5e4
9/16 00:00 9.409 0 -1.58 Rd8xd5+ Ke5xd5 Ke7xf6 Kd5c6 b6b5 a4xb5 a6xb5 Kc6xb5 Kf6e7 Kb5c5 Ke7d7 b4b5 Kd7c7
10/16- 00:00 11.838 0 -1.67 Rd8xd5+ Ke5xd5
10/19- 00:00 18.204 0 -1.84 Rd8xd5+ Ke5xd5
10/20- 00:00 33.211 2.075.000 -2.22 Rd8xd5+ Ke5xd5
10/20 00:00 76.037 1.246.000 -2.27 Rd8xd5+ Ke5xd5 Ke7xf6 Kd5c6 b6b5 a4xb5 a6xb5 Kc6xb5 h5h4 Kb5c5 Kf6e6 b4b5 Ke6d7 b5b6 Kd7c8
10/24 00:00 96.028 1.391.000 -2.15 b6b5 Rf6xg6 b5xa4 Rg6xa6 Rd8b8 Ra6xa4 Rb8b7 g2g3 Ke7d8 Ke5d6 Rb7d7+ Kd6c5 Rd7c7+ Kc5d4
11/24 00:00 142.814 1.660.000 -2.24 b6b5 a4xb5 a6xb5 Rf6xg6 Rd8a8 d5d6+ Ke7f7 Rg6e6 Ra8a2 Re6e7+ Kf7f8 g2g3 Ra2b2 Re7h7 Kf8e8
12/30- 00:00 217.062 1.226.000 -2.35 b6b5 a4xb5
12/30 00:00 320.051 1.212.000 -2.40 b6b5 a4xb5 a6xb5 Rf6xg6 Rd8f8 Rg6g7+ Ke7d8 Ke5d6 h5h4 Kd6c6 Rf8f2 d5d6 Rf2c2+ Kc6xb5 Rc2d2 Kb5c5 Rd2c2+ Kc5b6 Rc2d2 Kb6c6 Rd2c2+ Kc6b5 Rc2d2
13/31- 00:00 418.987 1.342.000 -2.53 b6b5 a4xb5
13/42 00:00 693.041 1.642.000 -2.70 b6b5 a4xb5 a6xb5 Rf6xg6 Rd8f8 Rg6g7+ Ke7d8 Ke5d6 Rf8f6+ Kd6c5 Rf6f2 Kc5xb5 Rf2c2 g2g3 Rc2c3 d5d6 Rc3e3 Kb5c6 Re3c3+ Kc6d5 Rc3d3+ Kd5c5 Rd3c3+ Kc5b5 Rc3e3
13/42 00:00 985.861 1.815.000 -2.61 Rd8e8 Rf6xb6 Ke7d7+ Rb6e6 Re8b8 Re6xg6 Rb8xb4 Rg6xa6 Rb4b2 Ra6a7+ Kd7e8 g2g3 Rb2b3 Ra7g7 h5h4 g3xh4 Rb3xh3 Ke5e6 Rh3e3+ Ke6d6
14/42- 00:00 1.236.075 1.890.000 -2.73 Rd8e8 Rf6xb6
14/42- 00:00 1.727.794 2.039.000 -2.99 Rd8e8 Rf6xb6
14/42 00:01 2.450.702 2.155.000 -2.71 Ke7d7 Rf6xb6 Rd8e8+ Rb6e6 Re8b8 Re6xg6 Rb8xb4 Rg6xa6 h5h4 a4a5 Rb4b2 Ra6a7+ Kd7c8 a5a6 Rb2xg2 Ra7h7 Rg2e2+ Ke5d4 Re2d2+ Kd4c5 Rd2c2+ Kc5d6 Kc8b8 Rh7xh4
15/42- 00:01 2.564.349 2.165.000 -2.84 Ke7d7 Rf6xb6
15/42- 00:01 2.866.555 2.198.000 -3.11 Ke7d7 Rf6xb6
15/42- 00:01 3.999.828 2.304.000 -3.78 Ke7d7 Rf6xb6
15/42 00:01 4.315.339 2.316.000 -3.21 a6a5 b4b5 Rd8g8 Rf6xb6 Ke7d7 Rb6d6+ Kd7c7 Rd6e6 Rg8g7 d5d6+ Kc7b6 Re6e8 g6g5 Ke5e6 Rg7g6+ Ke6d5 Rg6g7 Re8b8+ Kb6a7 Rb8h8 Ka7b7 Rh8xh5 Kb7b6 Rh5h8
16/42- 00:02 5.915.854 2.407.000 -3.37 a6a5 b4b5
16/45 00:03 9.494.308 2.533.000 -3.55 a6a5 b4b5 Rd8g8 Rf6xb6 Ke7d7 Rb6d6+ Kd7c8 Rd6c6+ Kc8b7 d5d6 g6g5 d6d7 g5g4 h3xg4 h5xg4 Rc6g6 Rg8h8 Ke5d6 g4g3 Rg6xg3 Rh8h6+ Kd6e5 Kb7c7 Rg3g7 Rh6h5+ Ke5f6 Kc7d8 g2g4 Rh5h4
16/45 00:04 10.259.660 2.547.000 -3.39 Rd8c8 Rf6xb6 Rc8c2 Rb6xg6 Rc2e2+ Ke5d4 Re2b2 Kd4c5 Rb2c2+ Kc5b6 Rc2c4 Rg6c6 Rc4d4 Kb6c5 Rd4d2 Rc6xa6 Rd2c2+ Kc5b5 Rc2d2 a4a5 Rd2xd5+ Kb5c4 Rd5d2 Ra6g6 Ke7f7 Rg6g5 Rd2c2+ Kc4b5
17/50- 00:05 12.970.048 2.598.000 -3.55 Rd8c8 Rf6xb6
17/50- 00:06 16.832.242 2.635.000 -3.87 Rd8c8 Rf6xb6
17/50 00:06 17.180.760 2.636.000 -3.55 a6a5 b4b5 Rd8g8 Rf6xb6 Ke7d7 Rb6d6+ Kd7c8 Rd6c6+ Kc8b7 d5d6 g6g5 d6d7 g5g4 h3xg4 h5xg4 Rc6g6 Rg8h8 Ke5d6 g4g3 Rg6xg3 Rh8h6+ Kd6e5 Kb7c7 Rg3g7 Rh6h5+ Ke5f6 Kc7d8 g2g4 Rh5h4
18/50- 00:07 20.767.045 2.656.000 -3.72 a6a5 b4b5
18/50- 00:11 29.370.668 2.686.000 -4.07 a6a5 b4b5
18/51- 00:19 53.471.167 2.763.000 -4.88 a6a5 b4b5
18/53 00:19 54.810.059 2.769.000 -4.29 Rd8c8 d5d6+ Ke7d7 Rf6f7+ Kd7c6 b4b5+ a6xb5 a4xb5+ Kc6xb5 d6d7 Rc8a8 Ke5d6 Kb5c4 Rf7f4+ Kc4c3 Rf4e4 Ra8a2 Re4e6 h5h4 d7d8Q Ra2d2+ Kd6c7 Rd2xd8 Kc7xd8 b6b5 Re6c6+ Kc3d4 Rc6b6 Kd4c5 Rb6xg6 b5b4 Rg6g5+ Kc5d6 Rg5b5
19/53- 00:27 76.182.527 2.766.000 -4.47 Rd8c8 d5d6+
19/54- 00:41 113.113.810 2.706.000 -4.82 Rd8c8 d5d6+
19/58 01:05 178.938.168 2.739.000 -5.61 Rd8c8 d5d6+ Ke7d7 Rf6f7+ Kd7c6 b4b5+ a6xb5 a4xb5+ Kc6xb5 d6d7 Rc8a8 Ke5d6 g6g5 Kd6e7 Kb5c4 h3h4 g5xh4 d7d8Q Ra8xd8 Ke7xd8 Kc4d4 Rf7f4+ Kd4e3 Rf4xh4 Ke3f2 Rh4xh5 Kf2xg2 Kd8c7 Kg2f3 Kc7xb6 Kf3g4 Rh5h7 Kg4f4 Kb6c5 Kf4e5 Rh7h4 Ke5f5
19/58 01:08 189.039.479 2.746.000 -4.89 a6a5 b4b5 Rd8h8 Rf6xb6 Ke7d7 Rb6xg6 Rh8e8+ Ke5d4 Kd7c7 b5b6+ Kc7b7 Kd4c5 Re8e7 Kc5b5 Re7d7 d5d6 Rd7f7 g2g4 h5xg4 h3xg4 Rf7h7 g4g5 Rh7f7 Rg6f6 Rf7h7 Kb5xa5 Kb7c6 g5g6 Rh7h8 g6g7 Rh8a8+ Ka5b4 Ra8g8 d6d7+ Kc6xd7 b6b7 Kd7c7 Rf6f8
20/58- 01:28 244.550.274 2.759.000 -5.10 a6a5 b4b5
20/58- 02:09 361.445.392 2.796.000 -5.50 a6a5 b4b5
20/58 03:13 549.655.187 2.837.000 -6.00 a6a5 b4b5 Rd8g8 Rf6xb6 Ke7d7 Rb6d6+ Kd7c8 Rd6c6+ Kc8d8 b5b6 Rg8g7 Rc6e6 Rg7b7 Re6xg6 Kd8e8 Rg6h6 Ke8f8 g2g3 Rb7d7 Rh6xh5 Kf8g7 Rh5f5 Kg7g6 Rf5f6+ Kg6g5 h3h4+ Kg5g4 Rf6g6+ Kg4h5 Rg6c6 Rd7e7+ Ke5f5 Re7f7+
20/59 03:15 556.254.118 2.841.000 -5.67 Rd8c8 d5d6+ Ke7d7 Rf6f7+ Kd7c6 b4b5+ a6xb5 a4xb5+ Kc6xb5 d6d7 Rc8a8 Ke5d6 g6g5 Kd6e7 Kb5c4 h3h4 g5xh4 d7d8Q Ra8xd8 Ke7xd8 Kc4d4 Rf7f4+ Kd4e3 Rf4xh4 Ke3f2 Rh4xh5 Kf2xg2 Kd8c7 Kg2f3 Kc7xb6 Kf3g4 Rh5d5 Kg4f4 Kb6c5 Kf4e4 Kc5d6
20/59 03:29 593.851.699 2.836.000 -5.58 g6g5 Rf6xb6 Rd8a8 Rb6b7+ Ke7f8 d5d6 g5g4 Rb7h7 g4xh3 g2xh3 Kf8g8 Rh7xh5 Kg8g7 d6d7 Kg7f7 Rh5h7+ Kf7g6 Rh7e7 Ra8d8 Ke5e6 Rd8f8 Re7e8 Rf8f6+ Ke6e7 Rf6f7+ Ke7d6 Rf7f6+ Kd6c7 Rf6f7 Re8e6+ Kg6f5 Re6xa6
21/59- 04:29 762.806.646 2.829.000 -5.82 g6g5 Rf6xb6