Ivanchuk-Anand, Linares 2009

[jdart]

Apparently there were a couple of points in this recent game where Ivanchuk missed a win. See http://www.chessgames.com/perl/chessgame?gid=1536017

One position is here:

[d] 5rk1/R5p1/4p3/4P1p1/P2P2P1/1r6/7P/4R1K1 w - -

bm d5. This looks very difficult. Rybka 3 likes 36. Rf1 initially and scores d5 as second best, at least through depth 16. I have not actually verified that d5 is a lot better but if I force that move I start to see higher scores for White from the resulting position.

The other position is here:

[d] 8/6pk/P3R3/6p1/4K1P1/7r/8/8 w - -

where Ivanchuk played 47. Kd5 but apparently the right move is Kd4. This is also quite hard. Rybka 3 likes Kd5 initially but does switch to Kd4 eventually.

Ivanchuk is a great player - too bad he missed these opportunities, but it is no shame to not find them over the board.

--Jon

[kgburcham]

Jon, it seems some programs do not have any trouble with these two 2700+ GM positions. Thanks for posting these.

[d] 5rk1/R5p1/4p3/4P1p1/P2P2P1/1r6/7P/4R1K1 w - -

14/39 0:19 +1.83 1.d5 Rb2 2.Rf1 exd5 3.Rxf8+ Kxf8 (49.698.683) 2488
15/39 0:25 +1.83 1.d5 Rb2 2.Rf1 exd5 3.e6 Re2 (64.517.440) 2484
16/39 0:31 +1.83 1.d5 Rb2 2.Rf1 exd5 3.e6 Re2 (79.590.590) 2492
17/44 0:48 +1.82 1.d5 Rb2 2.Rf1 exd5 3.e6 Re2 (121.662.669) 2521
18/46 1:29 +1.88 1.d5 Rb2 2.Rf1 exd5 3.a5 d4 (232.553.789) 2595
19/46 2:30 +1.87 1.d5 Rb2 2.Rf1 exd5 3.a5 (387.261.621) 2566
20/59 5:30 +1.78 1.d5 Rb2 2.Rf1 exd5 3.a5 Re8 (820.207.218) 2483
20/59 8:25 +1.78 1.d5 Rb2 2.Rf1 exd5 3.a5 Re8 4.Rf5 g6 5.Rf2 Rb4 6.h3 Rxe5 7.Rd7 Ra4 8.Rb2 Kf8 9.Rb8+ Re8 10.Rxe8+ Kxe8 11.Rxd5 Kf7 12.Rxg5 Ra1+ (1.236.499.871) 2446



[d] 8/6pk/P3R3/6p1/4K1P1/7r/8/8 w - -

17/32 0:00 +2.88 1.Kd4 Rg3 2.Kc5 Rxg4 3.a7 Ra4 (5.349.373)
18/36 0:01 +3.12 1.Kd4 Rg3 2.Kc5 Rxg4 3.a7 Ra4 (10.499.965) 5703
19/40 0:03 +3.15 1.Kd4 Rg3 2.Kc5 Rxg4 3.a7 Ra4 (21.444.380) 5902
20/43 0:07 +3.14 1.Kd4 Rg3 2.Kc4 Rxg4+ 3.Kb5 Rf4 (44.552.769) 5640
21/43 0:11 +3.10 1.Kd4 Rg3 2.Kc4 Rxg4+ 3.Kb5 Rf4 (63.300.047) 5607
22/43 0:30 +3.62 1.Kd4 Rg3 2.Kc5 Rxg4 3.a7 Ra4 (181.339.979) 5887
23/43 0:45 +3.40 1.Kd4 Rg3 2.Kc5 Rxg4 3.a7 Ra4 (268.873.766) 5866
24/43 1:32 +3.70 1.Kd4 Rg3 2.Kc5 Rxg4 3.a7 Ra4 (549.133.027) 5964
25/54 2:48 +3.68 1.Kd4 Rg3 2.Kc5 Rxg4 3.a7 Ra4 (973.751.350) 5778
26/54 4:47 +3.54 1.Kd4 Rg3 2.Kc5 Rxg4 3.a7 Ra4 (1.613.004.980) 5611
27/54 7:48 +3.68 1.Kd4 Rg3 2.Kc5 Rxg4 3.a7 Ra4 4.Kb6 g4 5.Kb7 g3 6.a8Q Rxa8 7.Kxa8 g2 8.Re1 Kg6 9.Kb7 Kf5 10.Rg1 g5 11.Rxg2 g4 12.Kc6 Kf4 13.Rg1 g3 (2.622.549.132) 5602

[Cubeman]

In the first position, Naum 4 likes 1.d5 as best at D=16 and gives modest +1.50.I am no GM and can't decide if it is the absolute best.Also Pocket Shredder jumps into 1.d5 right at the start and gives +2.37 but is based on the variation 1.d5 exd5?! 2.e6 d4 3.Rd7 d3 4.a5 Re8 5.a6 Ra3 6.a7 Kh7 7.e7.PF3 with Hiarcs 12.1 also finds 1.d5 at D=14 +1.48 with 1.d5 Rb2 2.Rf1 exd5 3.a5 d4 4.e6 Re8 5.e7 Re2 6.Rd1 Re4 7.h3.

[Terry McCracken]

Apparently there were a couple of points in this recent game where Ivanchuk missed a win. See http://www.chessgames.com/perl/chessgame?gid=1536017

One position is here:

[d] 5rk1/R5p1/4p3/4P1p1/P2P2P1/1r6/7P/4R1K1 w - -

bm d5. This looks very difficult. Rybka 3 likes 36. Rf1 initially and scores d5 as second best, at least through depth 16. I have not actually verified that d5 is a lot better but if I force that move I start to see higher scores for White from the resulting position.

The other position is here:

[d] 8/6pk/P3R3/6p1/4K1P1/7r/8/8 w - -

where Ivanchuk played 47. Kd5 but apparently the right move is Kd4. This is also quite hard. Rybka 3 likes Kd5 initially but does switch to Kd4 eventually.

Ivanchuk is a great player - too bad he missed these opportunities, but it is no shame to not find them over the board.

--Jon

It's position 2 that get's my attention as that is critical if you want to win.

Ivanchuk obviously grew weary at this point otherwise he would have spotted Kd4!! followed by Kc5! winning this basic Rook and Pawns ending.

He could have just overlooked it OTB but probably fatigue was to blame.

Terry

[Dann Corbit]

Apparently there were a couple of points in this recent game where Ivanchuk missed a win. See http://www.chessgames.com/perl/chessgame?gid=1536017

One position is here:

[d] 5rk1/R5p1/4p3/4P1p1/P2P2P1/1r6/7P/4R1K1 w - -

bm d5. This looks very difficult. Rybka 3 likes 36. Rf1 initially and scores d5 as second best, at least through depth 16. I have not actually verified that d5 is a lot better but if I force that move I start to see higher scores for White from the resulting position.

The other position is here:

[d] 8/6pk/P3R3/6p1/4K1P1/7r/8/8 w - -

where Ivanchuk played 47. Kd5 but apparently the right move is Kd4. This is also quite hard. Rybka 3 likes Kd5 initially but does switch to Kd4 eventually.

Ivanchuk is a great player - too bad he missed these opportunities, but it is no shame to not find them over the board.

--Jon

In the first position, Rybka appears to be aiming for a transposition of d5, intending to play it subsequently. Perhaps his real error here was his follow-up, or perhaps Rybka failed to properly consider the response Rd3. As for the second move, it does not show up until ply 24. Hard to fault someone for not seeing a full 13 moves ahead without error.

Code: Select all

Analysis from Q:\epd\sub\ia.epd   
2/24/2009 5:50:49 PM Level: 720 Seconds
Analyzing engine: Rybka 3

1) d5; id "Ivanchuk-Ana 
    Searching move: d4-d5
    Best move (Rybka 3): Re1-f1
    Not found in: 12:00
      2	00:00	         503	515.072	+1.76	Re1f1
      3	00:00	         799	818.176	+1.60	Re1f1
      4	00:00	       1.221	1.250.304	+1.73	Re1f1
      5	00:00	       1.989	119.808	+1.78	Re1f1 Rb3b4
      6	00:00	       6.385	198.128	+1.61	Re1f1 Rb3d3 Rf1xf8+ Kg8xf8 Ra7d7
      7	00:00	       8.923	190.357	+1.42	Re1f1 Rb3b4 Rf1xf8+ Kg8xf8 a4a5 Rb4xd4
      8+	00:00	      27.491	198.244	+1.62	Re1f1
      8	00:00	      28.518	205.650	+1.62	Re1f1 Rb3d3 Rf1xf8+ Kg8xf8 Ra7d7 Rd3a3
      9+	00:00	      37.327	202.237	+1.82	Re1f1
      9	00:00	      43.038	200.322	+1.74	Re1f1 Rb3d3 a4a5 Rd3xd4 h2h3 Rd4a4 a5a6 Ra4a2
     10	00:00	      61.048	221.677	+1.75	Re1f1 Rb3d3 a4a5 Rd3xd4 h2h3 Rd4a4 Rf1xf8+ Kg8xf8 a5a6 Ra4a2 Kg1f1 Kf8e8 Kf1e1 Ke8d8
     11	00:01	     278.611	234.234	+1.56	Re1f1 Rf8d8 Rf1d1 Rb3e3 a4a5 Re3xe5 h2h3 Re5e3 a5a6 Re3xh3 Ra7b7 Rh3h4
     12	00:01	     329.052	239.821	+1.47	Re1f1 Rf8d8 Rf1d1 Rb3e3 Ra7a5 Re3e4 h2h3 Kg8h7 Ra5a6 Rd8xd4 Rd1xd4 Re4xd4 a4a5 Rd4d5 Kg1f2
     13+	00:02	     472.964	244.233	+1.67	Re1f1
     13	00:04	     887.782	246.833	+1.69	Re1f1 Rf8d8 Rf1d1 Rb3e3 Kg1f2 Re3a3 a4a5 Rd8d5 Ra7e7 Rd5b5 Rd1d2 Rb5xa5 Re7xe6 Ra3h3 Kf2f1 Rh3h4
     14	00:04	     912.577	246.434	+1.69	Re1f1 Rf8d8 Rf1d1 Rb3e3 Kg1f2 Re3a3 a4a5 Rd8d5 Ra7e7 Rd5b5 Rd1d2 Rb5xa5 Re7xe6 Ra3h3 Kf2f1 Rh3h4
     15	00:09	   2.214.571	260.927	+1.46	Re1f1 Rf8d8 Rf1f7 Rd8xd4 Rf7xg7+ Kg8f8 Rg7d7 Rd4xg4+ Kg1f1 Rg4f4+ Kf1e2 Rb3b2+ Ke2d3 Rf4f3+ Kd3d4 Rb2d2+
     16	00:14	   3.522.479	262.424	+1.30	Re1f1 Rf8d8 Rf1f7 Rd8xd4 Rf7xg7+ Kg8f8 Rg7h7 Rd4xg4+ Kg1f2 Kf8g8 Ra7g7+ Kg8f8 Rg7c7 Rg4f4+
     17+	00:19	   4.951.699	263.158	+1.50	Re1f1
     17	00:25	   6.299.936	261.380	+1.31	Re1f1 Rf8c8 Rf1f7 Rc8c1+ Kg1g2 Rb3b2+ Rf7f2 Rb2b1 Rf2d2 Rc1g1+ Kg2f2 Rg1xg4 a4a5 Rg4f4+ Kf2g2 Rf4g4+ Kg2f3 Rg4f4+ Kf3e2 Rf4h4
     18	00:54	  14.079.456	268.025	+1.46	Re1f1 Rf8c8 d4d5 e6xd5 e5e6 Rc8e8 e6e7 Rb3e3 Rf1d1 Re8xe7 Ra7xe7 Re3xe7 a4a5 Re7c7 Rd1xd5 Rc7c1+ Kg1g2 Rc1c2+ Kg2g3 Rc2c3+
     19	01:29	  21.865.125	251.747	+1.57	Re1f1 Rf8c8 d4d5 e6xd5 e5e6 Rc8e8 e6e7 Rb3e3 Rf1d1
     20	01:37	  23.943.936	251.911	+1.57	Re1f1 Rf8c8 d4d5 e6xd5 e5e6 Rc8e8 e6e7 Rb3e3 Rf1d1
     21	02:10	  31.504.875	248.794	+1.57	Re1f1 Rf8c8 d4d5 e6xd5 e5e6 Rc8e8 e6e7 Rb3e3 Rf1d1
     22	03:02	  44.197.166	248.574	+1.57	Re1f1 Rf8c8 d4d5 e6xd5 e5e6 Rc8e8 e6e7 Rb3e3 Rf1d1
     23	05:39	  81.969.712	247.164	+1.51	Re1f1 Rf8c8 d4d5 Rc8c2 Rf1f2 Rc2c1+ Kg1g2 e6xd5 e5e6 Rc1e1 e6e7 Rb3e3 a4a5 Re3xe7 Ra7xe7 Re1xe7 Rf2d2 Re7d7 Rd2b2 d5d4 Kg2f3 Rd7d5 a5a6 Rd5a5
     24	10:18	 148.905.543	246.693	+1.50	Re1f1 Rf8c8 d4d5 Rc8c2 Rf1f2 Rc2c1+ Kg1g2 e6xd5 e5e6 Rc1e1 e6e7 Rb3e3 a4a5 Re3xe7 Ra7xe7 Re1xe7 Rf2d2 Re7d7 Rd2b2 d5d4 Kg2f2 Rd7e7 Rb2b8+ Kg8h7 a5a6 d4d3
   2/24/2009 6:04:06 PM, Time for this analysis: 00:12:00, Rated time: 12:00

2) Kd4; id "Ivanchuk-An 
    Searching move: Ke4-d4
    Best move (Rybka 3): Ke4-d4
    identical moves! Found in: 01:04
      2	00:00	          96	98.304	+3.48	a6a7
      3	00:00	         108	110.592	+3.22	a6a7
      4	00:00	         115	117.760	+3.27	a6a7
      5	00:00	         150	153.600	+3.22	a6a7 Rh3a3
      6	00:00	         524	536.576	+3.23	a6a7 Rh3a3 Re6e7 Kh7g6 Ke4e5 Ra3a5+
      7	00:00	       2.002	2.050.048	+2.91	a6a7 Rh3a3 Re6e7 Kh7g6 Ke4e5 Ra3a5+ Ke5e6 Ra5a6+ Ke6d5 Ra6a3 Kd5c6
      8	00:00	       2.651	2.714.624	+2.91	a6a7 Rh3a3 Re6e7 Kh7g6 Ke4e5 Ra3a5+ Ke5e6 Ra5a6+ Ke6d5 Ra6a3 Kd5c6
      9	00:00	       8.875	284.000	+2.91	Re6e7 Kh7g6 a6a7 Rh3a3 Ke4e5
     10	00:00	      12.452	398.464	+2.63	Re6e7 Rh3a3 a6a7 Ra3a5
     11	00:00	      23.421	303.583	+2.59	Re6e7 Rh3a3 a6a7 Ra3a5 Ke4d3 Kh7g6 Kd3c4 Kg6f6 Re7c7 g7g6 Kc4b4 Ra5a2 Kb4c5
     12	00:00	      24.320	226.397	+2.59	Re6e7 Rh3a3 a6a7 Ra3a5 Ke4d3 Kh7g6 Kd3c4 Kg6f6
     13	00:00	      28.726	171.019	+2.59	Re6e7 Rh3a3 a6a7 Ra3a5 Ke4d3 Kh7g6 Kd3c4 Kg6f6 Re7c7 g7g6 Kc4b4 Ra5a2 Rc7b7 Kf6e6 Kb4c5
     14	00:00	      37.638	154.165	+2.59	Re6e7 Rh3a3 a6a7 Ra3a5 Ke4d3 Kh7g6 Kd3c4 Kg6f6 Re7c7 g7g6 Kc4b4 Ra5a2 Rc7b7 Kf6e6 Kb4c5 Ke6e5 Kc5c6
     14+	00:00	      43.142	117.806	+2.79	Ke4d5
     14+	00:01	     133.187	138.601	+3.39	Ke4d5
     14	00:01	     181.565	136.909	+3.39	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5d6 Kh7h6 Kd6d7 Rc3c4 a6a7 Rc4a4 Rb6b7 Ra4a3
     15	00:01	     200.573	132.936	+3.38	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5d6 Kh7h6 Kd6d7 Rc3c4 a6a7 Rc4a4 Rb6b7 Ra4a3 Kd7c7 Ra3c3+ Kc7b6 Rc3b3+ Kb6c6 Rb3a3
     16	00:01	     204.468	127.745	+3.38	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5d6 Kh7h6 Kd6d7 Rc3c4 a6a7 Rc4a4 Rb6b7 Ra4a3 Kd7c7 Ra3c3+ Kc7b6 Rc3b3+ Kb6c6 Rb3a3
     17	00:02	     221.760	116.392	+3.38	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5d6 Kh7h6 Kd6d7 Rc3c4 a6a7 Rc4a4 Rb6b7 Ra4a3 Kd7e7 Ra3a5 Ke7f7 Ra5a4 Rb7c7
     18	00:02	     240.856	109.762	+3.38	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5d6 Kh7h6 Kd6d7 Rc3c4 a6a7 Rc4a4 Rb6b7 Ra4a3 Kd7e7 Ra3a5 Ke7f7 Ra5a4 Rb7c7 Ra4a6
     19	00:03	     305.404	106.589	+3.38	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5d6 Kh7h6 Kd6d7 Rc3c4 a6a7 Rc4a4 Rb6b7 Ra4a3 Kd7e7 Ra3a5 Ke7f7 Ra5a4 Rb7c7 Ra4a6 Rc7d7 Ra6a5
     20	00:04	     402.806	103.662	+3.38	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5d6 Kh7h6 Kd6d7 Rc3c4 a6a7 Rc4a4 Rb6b7 Ra4a3 Kd7e7 Ra3a5 Ke7f7 Ra5a4 Rb7c7 Ra4a6
     21	00:06	     675.925	103.413	+3.38	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5d6 Kh7h6 Kd6d7 Rc3c4 a6a7 Rc4a4 Rb6b7 Ra4a3 Kd7e7 Ra3a5 Ke7f7 Ra5a4 Rb7c7 Ra4a6 Rc7d7 Ra6f6+
     22	00:12	   1.068.497	90.030	+3.38	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5d6 Kh7h6 Kd6d7 Rc3c4 a6a7 Rc4a4 Rb6b7 Ra4a3 Kd7e7 Ra3a5 Ke7f7 Ra5a4 Rb7c7
     23	00:18	   1.497.779	84.460	+3.38	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5d6 Kh7h6 Kd6d7 Rc3c4 a6a7 Rc4a4 Rb6b7 Ra4a3 Kd7e7 Ra3a5 Ke7f7 Ra5a4 Rb7c7 Ra4a6 Rc7d7
     24	00:37	   3.439.136	95.128	+3.21	Ke4d5 Rh3c3 Re6b6 g7g6 Kd5e6 Rc3g3 a6a7 Rg3a3 Rb6b7+ Kh7h6 Ke6d7 Ra3a6 Kd7e7 Ra6a5 Ke7d7
     24+	01:04	   6.553.208	104.405	+3.58	Ke4d4
     24	03:51	  60.437.553	267.435	+4.23	Ke4d4
     25+	03:51	  60.439.421	267.426	+4.63	Ke4d4
     25+	04:06	  62.625.370	260.322	+4.83	Ke4d4
     25	04:14	  64.138.601	258.493	+4.63	Ke4d4 Rh3g3 Kd4c5 Rg3xg4 Re6e5 Rg4f4 a6a7 Rf4f8 Re5xg5 Kh7h6 Rg5d5 g7g5 Kc5c6 g5g4 Kc6b7 Rf8f7+ Kb7a6 Rf7f8 Rd5b5 g4g3 Rb5b8 g3g2 a7a8Q g2g1Q Qa8c6+ Kh6g7 Rb8b7+ Rf8f7 Qc6c3+ Kg7g6 Rb7b6+
     26+	04:57	  71.380.959	245.737	+4.83	Ke4d4
     26+	05:37	  79.090.296	240.026	+5.03	Ke4d4
     26	05:41	  79.824.889	239.246	+4.63	Ke4d4 Rh3g3 Kd4c5 Rg3xg4 Re6e5 Rg4f4 a6a7 Rf4f8 Re5xg5 Kh7h6 Rg5d5 g7g5 Kc5c6 g5g4 Kc6b7 Rf8f7+ Kb7a6 Rf7f8 Rd5b5 g4g3 Rb5b8 g3g2 a7a8Q g2g1Q Qa8c6+ Kh6g7 Rb8b7+ Rf8f7 Qc6c3+ Kg7g6 Rb7b6+
     27+	06:23	  88.066.463	235.304	+4.83	Ke4d4
     27+	07:11	  99.250.118	235.515	+5.03	Ke4d4
     27	10:19	 159.476.857	263.793	+4.66	Ke4d4 Rh3g3 Kd4c5 Rg3xg4 Re6e5 Rg4f4 a6a7 Rf4f8 Re5xg5 Kh7h6 Rg5d5 g7g5 Kc5c6 g5g4 Kc6b7 Rf8f7+ Kb7a6 Rf7f8 Rd5b5 g4g3 Rb5b8 g3g2 a7a8Q g2g1Q Qa8c6+ Kh6g7 Rb8b7+ Rf8f7 Qc6c3+ Kg7g6 Rb7b6+
     28+	11:44	 179.292.754	260.667	+4.86	Ke4d4
   2/24/2009 6:15:52 PM, Time for this analysis: 00:11:45, Rated time: 13:04

1 of 2 matching moves
2/24/2009 6:15:53 PM, Total time: 12:25:04 AM
Rated time: 13:04 = 784 Seconds

[Dann Corbit]

Here are the decorated EPD records, starting from the first position in question.

Code: Select all

2r2rk1/2Bn2p1/1p2p1p1/p2pP3/P7/1PR1P3/6PP/2R3K1 b - - acd 24; acn 110254069; acs 546; bm Rf5; ce -134; pv Rf5 g4 Rf3 Bd6 Nc5 R1c2 g5 Kg2 Rf7 Bxc5 bxc5 Rxc5 Rb8 Rb5 Ra8 Rb6 Re7 Rc5 Kf7 Kg3 Rd7 h3 Re7 Rcc6 Raa7 Rb5;
2r3k1/2Bn2p1/1p2p1p1/p2pPr2/P7/1PR1P3/6PP/2R3K1 w - - acd 23; acn 106876147; acs 513; bm g4; ce 132; pv g4 Rf7 Bd6 Nc5 Bxc5 bxc5 Rxc5 Rb8 Rb5 Ra8 Rb6 Re8 Kg2 g5 h3 Ra7 Rcc6 Kf7 Kg3 Ree7 Rb5 Re8 Kf3 Rf8;
2r3k1/2Bn2p1/1p2p1p1/p2pPr2/P5P1/1PR1P3/7P/2R3K1 b - - acd 24; acn 128192371; acs 617; bm Rf3; ce -131; pv Rf3 Bd6 Nc5 Kg2 Rf7 Bxc5 bxc5 Rxc5 Rcf8 R1c2 Ra7 Rb5 g5 Rb6 Re8 Rc5 Rf7;
2r3k1/2Bn1rp1/1p2p1p1/p2pP3/P5P1/1PR1P3/7P/2R3K1 w - - acd 26; acn 82905328; acs 380; bm Bd6; ce 134; pv Bd6 Nc5 Bxc5 bxc5 Rxc5 Rb8 Rb5 Ra8 Kg2 g5 Rc6 Raf8 Rc2 Ra7 h3 Rfa8 Rb6 Kf7 Rcc6 Re7 Rb5 Rea7;
2r3k1/3n1rp1/1p1Bp1p1/p2pP3/P5P1/1PR1P3/7P/2R3K1 b - - acd 25; acn 68357755; acs 314; bm Nc5; ce -134; pv Nc5 Bxc5 bxc5 Rxc5 Rb8 Rb5 Ra8 Kg2 g5 h3 Raf8 Rc2 Ra7 Rb6 Re8 Rcc6 Rf8 Rc1 Re8;
2r3k1/5rp1/1p1Bp1p1/p1npP3/P5P1/1PR1P3/7P/2R3K1 w - - acd 25; acn 154744276; acs 676; bm Bxc5; ce 130; pv Bxc5 bxc5 Rxc5 Rb8 Rb5 Ra8 Rb6 Re8 Kg2 g5 Rc2 Ra7 Kf2 Kf7 Rcc6 Rh8 Kg3 Re8 Kf3 Rh8 Kg2;
2r3k1/5rp1/1p2p1p1/p1BpP3/P5P1/1PR1P3/7P/2R3K1 b - - acd 25; acn 78594933; acs 359; bm bxc5; ce -136; pv bxc5 Rxc5 Rb8 Rb5 Ra8 Kg2 g5 Rb6 Re8 Rcc6 Ref8 Rc2;
2r3k1/5rp1/4p1p1/p1ppP3/P5P1/1PR1P3/7P/2R3K1 w - - acd 25; acn 88720444; acs 429; bm Rxc5; ce 133; pv Rxc5 Rb8 Rb5 Ra8 Kg2 g5 Rb6 Re8 Rc5 Kh8 Rc2 Ra7 Rcc6 Rf8 h3 Kg8 Rc2;
2r3k1/5rp1/4p1p1/p1RpP3/P5P1/1P2P3/7P/2R3K1 b - - acd 24; acn 132965510; acs 567; bm Rb8; ce -134; pv Rb8 Rb5 Ra8 Kg2 g5 Rb6 Re8 Rc2 Ra7 h3 Kf7 Rcc6 Ree7 Rb5 Red7 Rcc5 Rab7 Kf3 Rxb5 axb5 Rb7 Ke2 Ke7 Kd3 Kd7 e4;
5rk1/5rp1/4p1p1/p1RpP3/P5P1/1P2P3/7P/2R3K1 w - - acd 20; acn 30488326; acs 151; bm Rxa5; ce 168; pv Rxa5 Rf3 Re1 d4 Rc5 dxe3 Re2 R3f4 Rxe3 Rxg4+ Rg3 Rd4 Rc1 Re4 a5 Rxe5 b4 Rb5 Rc4 g5 Rd3 Ra8 Rd7 Ra6 Re7 Kf8 Rec7 Rd6;
5rk1/5rp1/4p1p1/R2pP3/P5P1/1P2P3/7P/2R3K1 b - - acd 21; acn 115732863; acs 508; bm Rf3; ce -142; pv Rf3 Rb5 Rxe3 a5;
5rk1/6p1/4p1p1/R2pP3/P5P1/1P2Pr2/7P/2R3K1 w - - acd 21; acn 142085517; acs 599; bm Rb5; ce 121; pv Rb5 Rxe3 Rf1 Rc8 a5 Re2 Rf2;
5rk1/R5p1/4p1p1/3pP3/P5P1/1P2Pr2/7P/2R3K1 b - - acd 24; acn 152946882; acs 708; bm Rxe3; ce -117; pv Rxe3 Rf1 Rc8 Rff7 Rxb3 Rxg7+ Kh8 Rh7+ Kg8 Rag7+ Kf8 Rf7+ Ke8 Re7+ Kd8 Rd7+ Ke8 Rhe7+ Kf8 Rf7+ Kg8 a5 Rc1+ Rf1 Rc6 Rd6 Rc2 Rf2 Rc4 h3 Rxh3;
5rk1/R5p1/4p3/3pP1p1/P5P1/1P2Pr2/7P/2R3K1 w - - acd 20; acn 15355113; acs 64; bm Rac7; ce 193; pv Rac7 d4 exd4 Rxb3 Rc8 Ra3 Rxf8+ Kxf8 Rc8+ Ke7 Rc7+ Kf8;
5rk1/R5p1/4p3/3pP1p1/P5P1/1P2Pr2/7P/4R1K1 b - - acd 24; acn 143416861; acs 615; bm d4; ce -151; pv d4 Rc7 dxe3 Rc3 R8f4 Rcxe3 Rxg4+ Kh1 Rf2 Rg1 Rxg1+ Kxg1 Ra2 Rg3 Ra3 h3 Kf7 Kf2 Kg6 Ke2 Kf5 Kd2 Ra2+ Kc3 Kf4 Rg4+ Kxe5 Rxg5+;
5rk1/R5p1/4p3/4P1p1/P2p2P1/1P2Pr2/7P/4R1K1 w - - acd 23; acn 110225084; acs 482; bm exd4; ce 150; pv exd4 Rxb3 d5 Rb2 Rf1 Rc8 Rf2 Rb1+ Kg2 exd5 e6 Re1 e7 Re8 Rd2 R8xe7 Rxe7 Rxe7 a5 Rd7 Rb2 Ra7 Rb5 Rc7 Rxd5;
5rk1/R5p1/4p3/4P1p1/P2P2P1/1P3r2/7P/4R1K1 b - - acd 23; acn 94400161; acs 430; bm Rxb3; ce -156; pv Rxb3 d5 Rb2 Rf1 Rc8 Rf2 Rb1+ Kg2 exd5 e6 Re1 e7 Re8 Rd2 R8xe7 Rxe7 Rxe7 a5 Rd7 Rb2 d4 Kf2 Ra7 Rb5 Rc7 a6;
5rk1/R5p1/4p3/4P1p1/P2P2P1/1r6/7P/4R1K1 w - - acd 24; acn 154417444; acs 634; bm d5; ce 156; pv d5 Rb2 Rf1 Rc8 Rf2 Rb1+ Kg2 exd5 e6 Re1 e7 Re8 Rd2 R1xe7 Rxe7 Rxe7 a5 Rd7 Rb2 Ra7 Rb5 Rc7 Rxd5;
5rk1/R5p1/4p3/4P1p1/P2P2P1/1r6/7P/5RK1 b - - acd 23; acn 171739727; acs 692; bm Rc8; ce -149; pv Rc8 d5 Rc2 Rf2 Rc4 Rff7 Rb1+ Kf2 Rb2+ Ke3 Rb3+ Kd2 exd5 Rxg7+ Kf8 Raf7+ Ke8 a5 Rb2+ Kd3 Rb3+ Ke2 Rb2+ Ke3 Rb3+;
5rk1/R5p1/4p3/4P1p1/P2P2P1/3r4/7P/5RK1 w - - acd 28; acn 113176810; acs 640; bm Rxf8+; ce 257; pv Rxf8+ Kxf8 a5 Rxd4 h3 Ra4 Kg2 Ke8 Kf3 g6 Ke3 Kd8 a6 Kc8 Kd3 Kd8 Kc3 Kc8 Kb3 Ra5 Kc4;
5Rk1/R5p1/4p3/4P1p1/P2P2P1/3r4/7P/6K1 b - - acd 30; acn 66681146; acs 477; bm Kxf8; ce -267; pv Kxf8 h3 Rxd4 a5 Ra4;
5k2/R5p1/4p3/4P1p1/P2P2P1/3r4/7P/6K1 w - - acd 29; acn 67663539; acs 466; bm h3; ce 266; pv h3 Rxd4 a5 Ra4 a6 Ke8 Kh2 Ra2+ Kg3 Ra3+ Kg2 Ra4 Kf3;
5k2/R5p1/4p3/P3P1p1/3P2P1/3r4/7P/6K1 b - - acd 29; acn 54277701; acs 380; bm Rxd4; ce -279; pv Rxd4 h3 Ra4 a6 Ke8 Kf2 Ra3 Kg2 Ra4 Kf3 Ra5 Ra8+ Kd7 a7 Ra3+ Ke4 Kc6 Rc8+ Kb7 Re8 Ra4+ Ke3 Rxa7 Rxe6 Kc8 Rg6 Kd8 Ke4 Ke8 Kf5 Kf8;
5k2/R5p1/4p3/P3P1p1/3r2P1/8/7P/6K1 w - - acd 30; acn 70369948; acs 498; bm h3; ce 273; pv h3 Ra4 a6 Ke8 Kf2 Ra3 Kg2 Kd8 Rxg7 Ra2+ Kf3 Ra3+ Ke2 Ra2+ Kd1 Ra1+ Kc2 Rxa6 Rxg5 Ra2+ Kb3 Rh2 Rh5 Ke8 Rh7 Re2 g5 Rg2 h4 Rg4 Rh6;
5k2/R5p1/4p3/P3P1p1/3r2P1/7P/8/6K1 b - - acd 29; acn 55476186; acs 379; bm Ra4; ce -268; pv Ra4 Kf2 Ra3 a6 Ke8 Kg2 Ra4 Kf3 Kd8 Rxg7 Ra3+ Kf2 Ra2+ Ke1;
6k1/R5p1/4p3/P3P1p1/3r2P1/7P/8/6K1 w - - acd 33; acn 92970102; acs 524; bm a6; ce 289; pv a6 Ra4 Kf2 Ra5 Ra8+ Kf7 a7;
6k1/R5p1/P3p3/4P1p1/3r2P1/7P/8/6K1 b - - acd 34; acn 117624300; acs 620; bm Ra4; ce -292; pv Ra4 Kf2 Ra3 Ra8+ Kf7 a7 Kg6 Ke2 Kf7 Kd2;
6k1/R5p1/P3p3/4P1p1/r5P1/7P/8/6K1 w - - acd 34; acn 114835776; acs 603; bm Kf2; ce 285; pv Kf2 Ra3 Ra8+ Kf7 a7 Kg6 Ke1 Kf7 Kd2 Kg6 Kc2;
6k1/R5p1/P3p3/4P1p1/r5P1/7P/5K2/8 b - - acd 34; acn 99865143; acs 518; bm Ra3; ce -295; pv Ra3 Ra8+ Kf7 a7 Kg6 Ke2 Kf7 Kd2 Kg6 Kc2 Kf7 Kb2 Ra4 Kb3;
6k1/R5p1/P3p3/r3P1p1/6P1/7P/5K2/8 w - - acd 33; acn 109410468; acs 496; bm Ra8+; ce 305; pv Ra8+ Kf7 a7 Ra3 Ke2 Kg6 Kd2 Kf7 Kc2 Ra6 Kd3;
6k1/R5p1/P3p3/r3P1p1/6P1/5K1P/8/8 b - - acd 32; acn 116681733; acs 680; bm Rxe5; ce -293; pv Rxe5 Re7 Ra5 Rxe6 Kf7 Rc6 Ra4 Ke3 Ke8 Rb6 Kd8 Rg6;
6k1/R5p1/P3p3/4r1p1/6P1/5K1P/8/8 w - - acd 32; acn 100028596; acs 631; bm Re7; ce 278; pv Re7 Ra5 Rxe6 Ra4 Rb6 Kf7 Ke3 Ke8 Rb8+ Kf7 Ra8 Kf6 a7 Kf7 Kd3 Ra3+ Kc4 Ra4+ Kc5;
6k1/4R1p1/P3p3/4r1p1/6P1/5K1P/8/8 b - - acd 30; acn 61414184; acs 357; bm Ra5; ce -290; pv Ra5 Rxe6 Kf7 Rb6 Ra4 Ke3 Ke7 Rb7+ Kf6 Ra7 Ke5 Ra8 Ra3+ Kd2 Kf6 a7 Kf7 Kc2 Kg6 Kb2 Ra6 Kb3 Ra1 Kb4;
8/4R1pk/P3p3/4r1p1/6P1/5K1P/8/8 w - - acd 30+; acn 109607299; acs 672; bm Re8; ce 375; pv Re8;
4R3/6pk/P3p3/4r1p1/6P1/5K1P/8/8 b - - acd 31; acn 95137763; acs 580; bm Ra5; ce -326; pv Ra5 Rxe6 Ra4 Ke3 Kg8 Kd2 Kf7 Rb6 Ke8 Kc2;
4R3/6pk/P3p3/r5p1/6P1/5K1P/8/8 w - - acd 32; acn 84902204; acs 533; bm Rxe6; ce 320; pv Rxe6 Kg8 Rb6 Kf8 Ke4 Ke8 Kd3 Kd8 Kc4 Kc7 Rb7+ Kc8 Rxg7 Rxa6 Rxg5 Kd7 h4 Ke8 Kd4 Kf7 h5 Rb6 Ke3 Rb3+ Kf4 Rb4+ Kg3 Rb6 Re5 Rb1 Kf4;
8/6pk/P3R3/r5p1/6P1/5K1P/8/8 b - - acd 29; acn 18618377; acs 93; bm Ra4; ce -300; pv Ra4 Ke3 Kg8 Kd3 Kf7 Rb6 Ke8 Kc3 Kd7 Rg6 Kc8 Kb3 Ra1 Kb4;
8/6pk/P3R3/6p1/6P1/r4K1P/8/8 w - - acd 25+; acn 36165266; acs 179; bm Ke4; ce 486; pv Ke4;
8/6pk/P3R3/6p1/4K1P1/r6P/8/8 b - - acd 26; acn 82496331; acs 321; bm Rxh3; ce -421; pv Rxh3 Kd4 Rg3 Kc5 Rxg4 Re5 Rf4 a7 Rf8 Rxg5 Kh6 Re5 g5 Kc6 g4 Rb5 g3 Rb8 g2 Rxf8 g1=Q a8=Q Qg2+ Kd7 Qg4+ Kc7 Qg3+;
8/6pk/P3R3/6p1/4K1P1/7r/8/8 w - - acd 24; acn 134125260; acs 405; bm Kd4; ce 512; pv Kd4;
8/6pk/P3R3/3K2p1/6P1/7r/8/8 b - - acd 31; acn 143022366; acs 634; bm Rc3; ce -325; pv Rc3 Rd6 Rc2 Rb6 Rc1 Rd6;
8/6pk/P3R3/3K2p1/6P1/2r5/8/8 w - - acd 31; acn 161231271; acs 692; bm Rd6; ce 319; pv Rd6 Rc1 Rb6 g6 Ke6 Kg7 Kd6 Kh6;
8/6pk/PR6/3K2p1/6P1/2r5/8/8 b - - acd 31; acn 118811520; acs 525; bm Rc2; ce -341; pv Rc2 a7 Ra2 Rb7 Kh6 Kd6 Ra1 Kc6 g6 Kd7 Ra2 Rc7 Ra6;
8/7k/PR4p1/3K2p1/6P1/2r5/8/8 w - - acd 30+; acn 172440042; acs 678; bm Rc6; ce 369; pv Rc6;
8/7k/PR1K2p1/6p1/6P1/2r5/8/8 b - - acd 31; acn 147951896; acs 574; bm Kh6; ce -236; pv Kh6 Kd7 Rc2 Ke8 Rc8+ Kf7;
8/8/PR1K2pk/6p1/6P1/2r5/8/8 w - - acd 32; acn 94555199; acs 342; bm Kd7; ce 337; pv Kd7 Rg3 a7 Ra3 Rb7 Kg7 Ke6+ Kh6 Ke7 Re3+ Kd8 Ra3;
1R6/8/P2K2pk/6p1/6P1/2r5/8/8 b - - acd 36; acn 105089187; acs 519; bm Ra3; ce -234; pv Ra3 Ra8 Ra1 Kc7 Rc1+ Kd8 Rd1+ Ke7 Kg7 a7 Ra1 Ke6 Ra5 Kd6;
1R6/8/P2K2pk/6p1/6P1/r7/8/8 w - - acd 34; acn 111487067; acs 524; bm Rh8+; ce 239; pv Rh8+ Kg7 Ra8 Kf6 Kc5 Ra1 a7 Kg7 Kb6 Rb1+ Ka5 Ra1+ Kb5 Rb1+ Kc6 Rc1+;
R7/8/P2K2pk/6p1/6P1/r7/8/8 b - - acd 38; acn 112328236; acs 660; bm Ra2; ce -242; pv Ra2 Ke7 Re2+ Kf7 Rf2+ Kg8 Rf6 a7 Ra6 Kf7 Kh7 Ke7 Kg7 Kd7;
R7/6k1/P2K2p1/6p1/6P1/r7/8/8 w - - acd 36; acn 155726858; acs 716; bm a7; ce 225; pv a7 Ra6+ Kc7 Ra2 Kb7 Rb2+ Kc6 Rc2+;
R7/6k1/P5p1/2K3p1/6P1/r7/8/8 b - - acd 35; acn 113722320; acs 630; bm Ra2; ce -227; pv Ra2 Kb6 Rb2+ Kc7 Ra2 Kb7 Rb2+ Kc6 Ra2;
R7/6k1/P5p1/2K3p1/6P1/8/8/r7 w - - acd 36; acn 111506848; acs 498; bm a7; ce 227; pv a7 Ra2 Kb6 Rb2+ Kc6 Rc2+ Kb5 Ra2 Kc5 Ra3;
R7/6k1/PK4p1/6p1/6P1/8/8/r7 b - - acd 33; acn 200434703; acs 715; bm Rb1+; ce -223; pv Rb1+ Kc5 Rc1+ Kb4 Rb1+ Kc3 Rc1+ Kb3 Rb1+;
R7/6k1/PK4p1/6p1/6P1/8/8/1r6 w - - acd 34; acn 141182090; acs 644; bm Kc5; ce 222; pv Kc5 Rc1+ Kb4 Rb1+ Kc3 Rc1+ Kb2 Rc6 Kb3 Re6 a7 Ra6 Kb4;
R7/K5k1/P5p1/6p1/6P1/8/8/1r6 b - - acd 27+; acn 148601178; acs 516; bm Rb4; ce -69; pv Rb4;
R7/K5k1/P5p1/6p1/1r4P1/8/8/8 w - - acd 31; acn 181274073; acs 717; bm Rc8; ce 235; pv Rc8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+;
1R6/K5k1/P5p1/6p1/1r4P1/8/8/8 b - - acd 29; acn 174219146; acs 598; bm Rxg4; ce 0; pv Rxg4 Rb5 Ra4 Kb6 g4 a7 g3 Rg5 Kf6 Rxg3 Kf5 Rb3 Kf4 Rb2 g5 Rf2+ Ke4;
1R6/K5k1/P5p1/6p1/6r1/8/8/8 w - - acd 28; acn 190501098; acs 605; bm Rb5; ce 0; pv Rb5 Ra4 Rxg5 Rb4 Rc5 Kf6 Rc6+ Kf5 Rb6 Ra4 Rb5+ Kf4 Kb6 Rxa6+ Kxa6 g5 Rb4+ Kf3 Rb3+ Kf4 Rb1 g4;
8/K5k1/P5p1/1R4p1/6r1/8/8/8 b - - acd 29; acn 175732844; acs 593; bm Ra4; ce 0; pv Ra4 Rxg5 Rb4 Rc5 Kf6 Rc8 g5 Rb8 Re4 Rf8+ Kg6 Kb6 Re6+ Ka5 Re7 Rb8 g4 Rb7 Re5+ Kb4 Re8;
8/K5k1/P5p1/1R4p1/r7/8/8/8 w - - acd 26; acn 167078530; acs 530; bm Kb6; ce 0; pv Kb6 g4;
8/K5k1/P5p1/6R1/r7/8/8/8 b - - acd 59; acn 29; acs 0; bm Rb4; ce 0; pv Rb4 Ka8;
8/K5k1/P5p1/6R1/1r6/8/8/8 w - - acd 59; acn 368; acs 0; bm Rxg6+; ce 0; pv Rxg6+ Kxg6;
8/K5k1/P5p1/2R5/1r6/8/8/8 b - - acd 59; acn 38; acs 0; bm Rb1; ce 0; pv Rb1 Ka8;
8/K7/P5pk/2R5/1r6/8/8/8 w - - acd 59; acn 418; acs 0; bm Rc1; ce 0; pv Rc1 g5;
8/K7/P1R3pk/8/1r6/8/8/8 b - - acd 59; acn 46; acs 0; bm Rb1; ce 0; pv Rb1 Ka8;
8/K7/P1R3p1/7k/1r6/8/8/8 w - - acd 59; acn 368; acs 0; bm Rxg6; ce 0; pv Rxg6 Kxg6;
8/K7/PR4p1/7k/1r6/8/8/8 b - - acd 59; acn 46; acs 0; bm Ra4; ce 0; pv Ra4 Kb7;
8/K7/PR4p1/7k/5r2/8/8/8 w - - acd 59; acn 418; acs 0; bm Rxg6; ce 0; pv Rxg6 Kxg6;
8/K7/P5p1/1R5k/5r2/8/8/8 b - - acd 59; acn 92; acs 0; bm Kg4; ce 0; pv Kg4 Ka8;
8/K7/P7/1R4pk/5r2/8/8/8 w - - acd 59; acn 468; acs 0; bm Rxg5+; ce 0; pv Rxg5+ Kxg5;
8/8/PK6/1R4pk/5r2/8/8/8 b - - acd 59; acn 233; acs 0; bm Rf6+; ce 0; pv Rf6+ Kb7 Rf7+ Ka8 Kg4 a7 Kf4 Rb1 Ke4 Rc1 Rf2 Kb7 Rb2+ Kc6 Ra2;
8/8/PK3r2/1R4pk/8/8/8/8 w - - acd 59; acn 240; acs 0; bm Ka5; ce 0; pv Ka5 Rf7 Rb7;
8/8/P4r2/KR4pk/8/8/8/8 b - - acd 59; acn 46; acs 0; bm Rf1; ce 0; pv Rf1 a7;
8/5r2/P7/KR4pk/8/8/8/8 w - - acd 59; acn 443; acs 0; bm Rxg5+; ce 0; pv Rxg5+ Kxg5;
8/5r2/PK6/1R4pk/8/8/8/8 b - - acd 59; acn 19; acs 0; bm Rf6+; ce 0; pv Rf6+;
8/8/PK3r2/1R4pk/8/8/8/8 w - - acd 59; acn 193; acs 0; bm Ka5; ce 0; pv Ka5 Rf7;

[jarechu]

A little bit later, after Anand 48... g6 there was still a win for white:

[d] 8/7k/PR4p1/3K2p1/6P1/2r5/8/8 w - -

49.Rc6!

[Dann Corbit]

A little bit later, after Anand 48... g6 there was still a win for white:

[d] 8/7k/PR4p1/3K2p1/6P1/2r5/8/8 w - -

49.Rc6!

Last possible chance is here:
R7/K5k1/P5p1/6p1/1r4P1/8/8/8 w - - acd 31; acn 181274073; acs 717; bm Rc8; ce 235; pv Rc8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7 Re8 Kh6 Rh8+ Kg7

Move actually played was Rb8 {which leads directly to a draw} instead of Rc8 {which may still have winning chances}.

[PauloSoare]

In the first position, Naum 4 likes 1.d5 as best at D=16 and gives modest +1.50.I am no GM and can't decide if it is the absolute best.Also Pocket Shredder jumps into 1.d5 right at the start and gives +2.37 but is based on the variation 1.d5 exd5?! 2.e6 d4 3.Rd7 d3 4.a5 Re8 5.a6 Ra3 6.a7 Kh7 7.e7.PF3 with Hiarcs 12.1 also finds 1.d5 at D=14 +1.48 with 1.d5 Rb2 2.Rf1 exd5 3.a5 d4 4.e6 Re8 5.e7 Re2 6.Rd1 Re4 7.h3.

I don´t know how white can win after: 1. d5 Rb2 2. Rf1 Rc8.
I think this position it´s a draw.

[bob]

Apparently there were a couple of points in this recent game where Ivanchuk missed a win. See http://www.chessgames.com/perl/chessgame?gid=1536017

One position is here:

[d] 5rk1/R5p1/4p3/4P1p1/P2P2P1/1r6/7P/4R1K1 w - -

bm d5. This looks very difficult. Rybka 3 likes 36. Rf1 initially and scores d5 as second best, at least through depth 16. I have not actually verified that d5 is a lot better but if I force that move I start to see higher scores for White from the resulting position.

The other position is here:

[d] 8/6pk/P3R3/6p1/4K1P1/7r/8/8 w - -

where Ivanchuk played 47. Kd5 but apparently the right move is Kd4. This is also quite hard. Rybka 3 likes Kd5 initially but does switch to Kd4 eventually.

Ivanchuk is a great player - too bad he missed these opportunities, but it is no shame to not find them over the board.

--Jon

I ran both on Crafty. The first it likes d5 by the 1/2 second mark and never changes... score +2.x The second took 5 minutes to switch to Kd4. It generally liked Kd5 until it later switched to Kf5 before finally going to Kd4...score was +4 at last output.