Pesky FEN of the Day

[zullil]

I also have mate in 25:
[d]4r3/2k1p2q/pp1nR1p1/2pP1pP1/2P2P2/1P6/P1K3B1/4Q3 w - - acd 101; bm Rxd6; ce 32718; id "ECM.258"; c0 "Re6xNd6 (got a !? but game-theor optimal) (Krogius_EofCM) #1196 white_wins"; c3 "Rxd6"; dm 25; pv Rxd6 Kxd6 Qe6+ Kc7 d6+ Kd8 d7 Qh2 Qc6 Qxg2+ Qxg2 Kxd7 Qb7+ Kd8 Qxb6+ Kd7 Qb7+ Kd6 Qxa6+ Kd7 Qb5+ Kd8 b4 cxb4 c5 b3+ axb3 e6 c6 Ke7 Qb7+ Kf8 c7 Kg8 c8=Q Rxc8+ Qxc8+ Kg7 Kc3 Kf7 Qc7+ Kf8 Kd4 Kg8 Ke5 Kh8 Kf6 e5 Qg7#;

I (currently) have mate-in-24. Or, I should say, Cfish-dev does:

info depth 102 seldepth 48 multipv 1 score mate 24 nodes 658978732140 nps 63945545 hashfull 1000 tbhits 4935556594 time 10305311 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6a7 d7d8 d5d6 e7d6 a7h7 e8e2 c2c3 e2g2 h7g6 d8c7 g6f5 a6a5 g5g6 g2g3 f5d3 g3g2 f4f5 a5a4 f5f6 d6d5 d3d5 g2g3 c3d2 a4b3 f6f7 b3b2 f7f8q b2b1n d2c1 g3g1 c1b2 g1g2 d5g2 b1d2 f8c5 c7b8 c5b6 b8c8 g2h3

[MikeB]

[d]4r3/2k1p2q/pp1nR1p1/2pP1pP1/2P2P2/1P6/P1K3B1/4Q3 w - - 0 1

I was unable to locate the origin of this position, but it is either published wrong or a real pain. I had it annotated as a mate in 24 but all of the hour long searches, using many engines, only a few could get to M25. The first few moves seem easy, starting with a Rook sac. It needs more threads and RAM than I have available.

cur-dev BF NN sees a mate in 26 just under 8 minutes

Code: Select all

$ Blu*Ir4.exe



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     #     # #      #    # #      #      #      # #    # ~~~ ~~ `*-._`._(__.--*'`.) ~ ~~~ # #    #
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     ######  ######  ####  ###### #      #  ####  #    # ~~~ ~~ ~~~ ~~ ~~~ ~~~ ~~ ~ ~~~ #     # ###


    Bluefish XIr4  by Stockfish Developers as noted in the AUTHORS file
p f 4r3/2k1p2q/pp1nR1p1/2pP1pP1/2P2P2/1P6/P1K3B1/4Q3 w - -
s usenn true
Confirmation: usenn set to true
s t 60
info string Hash Table: Windows Large Pages, 256 Mb
Confirmation: Threads set to 60
s h 40960
info string Hash Table: Windows Large Pages, 40960 Mb
g Confirmation: Hash set to 40960 Mb
m 20

info string NNUE evaluation using eval.bin enabled.
info depth 1 seldepth 1 multipv 1 score cp 174 nodes 14942 nps 3735500 tbhits 0 time 4 pv e1e5
info depth 2 seldepth 2 multipv 1 score cp 334 nodes 47290 nps 9458000 tbhits 0 time 5 pv e6d6 e7d6 e1e8
info depth 3 seldepth 4 multipv 1 score cp 318 nodes 65083 nps 13016600 tbhits 0 time 5 pv e6d6 e7d6 e1e8
info depth 4 seldepth 6 multipv 1 score cp 321 nodes 74219 nps 14843800 tbhits 0 time 5 pv e6d6 e7d6 e1e8 h7d7
info depth 5 seldepth 8 multipv 1 score cp 325 nodes 85206 nps 17041200 tbhits 0 time 5 pv e6d6 h7h2 d6c6 c7b7 e1d2 a6a5
info depth 6 seldepth 10 multipv 1 score cp 334 nodes 95677 nps 19135400 tbhits 0 time 5 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8c8 b6c5 c8d7
info depth 7 seldepth 11 multipv 1 score cp 335 nodes 111177 nps 22235400 tbhits 0 time 5 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8a7 d7d8 a7b6 d8c8 b6a6 c8d8
info depth 8 seldepth 23 multipv 1 score cp 253 nodes 168532 nps 28088666 tbhits 0 time 6 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7
info depth 9 seldepth 24 multipv 1 score cp 365 nodes 253265 nps 36180714 tbhits 0 time 7 pv e6d6 e7d6 e1e8 c7b7 e8c6 b7a7 c6d6 h7h2 d6e7 a7a8
info depth 10 seldepth 19 multipv 1 score cp 373 nodes 374205 nps 41578333 tbhits 0 time 9 pv e6d6 h7h2 d6c6 c7b7 e1e2 a6a5 c6e6 a5a4 b3a4 b7b8 e6b6 b8c7
info depth 11 seldepth 17 multipv 1 score cp 413 nodes 433922 nps 48213555 tbhits 0 time 9 pv e6d6 e7d6 e1e8 c7b7 e8c6 b7a7 c6d6 a6a5 d6e6
info depth 12 seldepth 16 multipv 1 score cp 402 nodes 575113 nps 52283000 tbhits 0 time 11 pv e6d6 e7d6 e1e8 h7d7 e8a8 d7e7 a8c6 c7d8 c2d1 a6a5 c6b6 d8e8 b6c6 e8f7
info depth 13 seldepth 20 multipv 1 score cp 437 nodes 804723 nps 57480214 tbhits 0 time 14 pv e6d6 e7d6 e1e8 h7d7 e8a8 d7e7 c2d1 e7e3 a8c6 c7b8 c6b6 b8a8 b6a6 a8b8
info depth 14 seldepth 24 multipv 1 score cp 476 nodes 1710915 nps 63367222 tbhits 0 time 27 pv e6d6 e7d6 e1e8 h7d7 e8a8 d7e7 a8c6 c7d8 c2d1 a6a5 c6b6 e7c7 b6c6 c7c6 d5c6 d8c7 d1e1 c7c8
info depth 15 seldepth 21 multipv 1 score cp 534 nodes 3131220 nps 68070000 tbhits 0 time 46 pv e6d6 e7d6 e1e8 c7b7 e8c6 b7a7 c6d6 a6a5 d6e5 h7h2 e5e2 h2f4 d5d6 f4d6 e2f3 d6b8
info depth 16 seldepth 22 multipv 1 score cp 507 nodes 3280670 nps 68347291 tbhits 0 time 48 pv e6d6 e7d6 e1e8 c7b7 e8c6 b7a7 c6d6 a6a5 d6e6 h7h2 e6e2 h2f4 d5d6 f4d6 e2f3 d6b8 f3d5 b8c8 d5c6 c8c6 g2c6
info depth 17 seldepth 24 multipv 1 score cp 543 nodes 4584001 nps 69454560 tbhits 0 time 66 pv e6d6 h7h2 d6c6 c7b8 e1d2 e8c8 c6e6 b6b5 d5d6 c8d8 g2d5 h2d2 c2d2 e7d6 c4b5 a6b5
info depth 18 seldepth 26 multipv 1 score cp 568 nodes 5706717 nps 71333962 tbhits 0 time 80 pv e6d6 e7d6 e1e8 h7d7 e8g6 a6a5 c2d2 a5a4 g2f1 b6b5 c4b5 c7b7 f1d3 a4a3 b5b6 d7d8 g6g7 b7b6 g7f6 d8c7 g5g6 b6a5 f6c3 a5b6
info depth 19 seldepth 38 multipv 1 score cp 612 nodes 9026302 nps 74597537 tbhits 0 time 121 pv e6d6 e7d6 e1e8 h7d7 e8g6 b6b5 g2f1 b5c4 f1c4 c7b7 g6e6 d7h7 g5g6 h7h2 c4e2 c5c4 b3c4 h2f4 g6g7 f4d4
info depth 20 seldepth 46 multipv 1 score cp 680 nodes 11016190 nps 75973724 tbhits 0 time 145 pv e6d6 e7d6 e1e8 h7d7 e8g6 d7e7 g6e6 e7g7 e6f6 g7f6 g5f6 c7d7 g2h3 d7e8 h3f5 e8f7 f5h3 f7f6 h3e6 f6e7 b3b4 c5b4 c2b3
info depth 21 seldepth 32 multipv 1 score cp 731 nodes 16841836 nps 79069652 tbhits 0 time 213 pv e6d6 e7d6 e1e8 h7d7 e8g6 a6a5 g6e6 d7g7 e6f6 g7f6 g5f6 c7d7 g2h3 d7e8 h3f5 e8f7 f5h3 f7f6 c2b2 f6e7 b2a3 e7f8 h3e6 a5a4
info depth 22 seldepth 38 multipv 1 score cp 803 nodes 33898682 nps 83085004 tbhits 0 time 408 pv e6d6 e7d6 e1e8 h7d7 e8g6 b6b5 g2f1 d7d8 c4b5 a6b5 g6f6 b5b4 f6d8 c7d8 f1h3 d8e8 h3f5 e8f8 f5d3 f8g8 c2d2 g8g7 d3b1 g7g8 b1f5 g8g7
info depth 23 seldepth 40 multipv 1 score cp 837 nodes 53563253 nps 84484626 tbhits 0 time 634 pv e6d6 e7d6 e1e8 h7d7 e8g6 d7e7 g6e6 e7g7 e6e8 g7d7 e8d7 c7d7 g2h3 d7e7 h3f5 e7e8 f5d3 e8f7 c2c3 f7g7 b3b4 g7f8 b4c5 b6c5 c3b3 a6a5 b3a4 f8f7
info depth 24 seldepth 42 multipv 1 score cp 852 nodes 81763117 nps 83177128 tbhits 0 time 983 pv e6d6 e7d6 e1e8 h7d7 e8g6 b6b5 g2f1 c7b7 c4b5 a6a5 f1d3 a5a4 g6f5 d7d8 f5f7 b7b6 f7f6 d8d7 g5g6 b6a5 f6c3 a5b6 b3a4 d7e8 a4a5 b6b7 a2a4 e8g8 a5a6 b7b6 a4a5 b6c7 a6a7 g8a8 b5b6 c7d7 c3g7 d7e8 d3b5 e8d8
info depth 25 seldepth 47 multipv 1 score cp 860 nodes 108355125 nps 82025075 hashfull 11 tbhits 0 time 1321 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8a7 d7d8 d5d6 e7d6 a7h7 e8e2 c2d1 e2g2 h7g6 d8c7 g6f7 c7d8 f7d5 g2g1 d1e2 d8c7 d5f7 c7c6 f7f5 b6b5 c4b5 a6b5 e2f3 g1a1 f5c8 c6b6 c8b8 b6c6 b8a8 c6d7 f3g4 a1c1 a8b7 d7e6 b7c6 e6e7 c6c7 e7e6
info depth 26 seldepth 46 multipv 1 score cp 868 nodes 132402057 nps 81478188 hashfull 16 tbhits 0 time 1625 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8a7 d7d8 d5d6 e7d6 a7h7 e8e2 c2d1 e2g2 h7g6 d8c7 g6f7 c7d8 f7d5 g2g1 d1e2 d8c7 d5f7 c7c6 f7f5 b6b5 f5d5 c6c7 c4b5 a6b5 e2f3 c7d8 d5d6 d8e8 d6c6 e8f7 c6d7 f7g6 d7e8 g6h7 e8f7 h7h8 f7f8 h8h7
info depth 27 seldepth 52 multipv 1 score cp 881 nodes 205379041 nps 80446157 hashfull 22 tbhits 0 time 2553 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 g2g3 d3e2 d8c7 g6f5 g3g2 e2d3 g2a2 f5f7 c7c6 f7e8 c6c7 e8e7 c7c6 e7d8 a2a1 d8c8 c6b6 d3e4 a1d1 c8d8 b6b7 e4f5 d1d4 d8d7 b7b6 d7c8 d4d3 c8b8 b6c6 b8d8
info depth 28 seldepth 54 multipv 1 score cp 887 nodes 244332380 nps 80425404 hashfull 27 tbhits 0 time 3038 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 g2g3 d3e2 d8c7 g6f5 g3g2 e2d3 g2f2 f5f7 c7c6 f7f8 c6c7 d3e4 f2a2 f8f7 c7c6 f7g8 a2e2 e4f5 c6c7 g8h7 c7d8 h7f7 a6a5 f7b7 e2e7 b7c6 a5a4 c6a4 e7f7 f5g4 f7e7 a4a8 d8d7
info depth 29 seldepth 58 multipv 1 score cp 887 nodes 281330941 nps 80380268 hashfull 31 tbhits 0 time 3500 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 g2g3 d3e2 d8c7 g6f5 g3g2 e2f3 g2a2 f5f7 c7b6 f7d5 b6c7 f3e4 a2e2 e4f5 e2e3 d5f7 c7b6 f7d7 e3d3 d7d8 b6c6 d8c8 c6b6 c8b8 b6c6 b8a7 d3d1 a7e7 d1d3 e7e4 d6d5 e4e6 c6b7 c4d5
info depth 30 seldepth 56 multipv 1 score cp 888 nodes 315068402 nps 80333605 hashfull 33 tbhits 0 time 3922 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6a7 d7d8 d5d6 e7d6 a7h7 e8e2 c2d3 e2g2 h7g6 g2g3 d3e2 g3g2 e2f3 g2d2 g6f5 d8c7 f5f7 c7c6 f7e8 c6b6 e8e7 b6c6 e7e1 d2h2 e1e8 c6c7 e8f7 c7b6 f7d7 h2d2 g5g6 d2d3 f3g4 d3d1 g6g7 b6a5 d7d8 a5b4 a2a3 b4a3 g4f5
info depth 31 seldepth 52 multipv 1 score cp 889 nodes 328617830 nps 80307387 hashfull 38 tbhits 0 time 4092 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6a7 d7d8 d5d6 e7d6 a7h7 e8e2 c2d3 e2g2 h7g6 g2g3 d3e2 d8c7 g6f7 c7b6 f7f5 g3g2 e2d3 g2g1 f5d5 g1g3 d3e4 b6c7 e4f5 g3e3 d5a8 c7b6 a8b8 b6c6 f5g4 e3e2 b8d8 e2a2 d8e8 c6c7 e8e7 c7c6 g4f5
info depth 32 seldepth 52 multipv 1 score cp 889 nodes 346832475 nps 80285295 hashfull 39 tbhits 0 time 4320 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 g2g3 d3e2 d8c7 g6f7 c7b6 f7f5 g3g2 e2d3 g2g1 f5d5 g1g3 d3e4 b6c7 e4f5 g3e3 d5a8 c7b6 a8b8 b6c6 f5g4 e3d3 b8c8 c6b6 c8d8 b6c6 g4f5 d3e3 d8f6 c6c7 f6f8 e3d3 f8e7 c7b6
info depth 33 seldepth 64 multipv 1 score cp 909 nodes 599786907 nps 80997556 hashfull 73 tbhits 0 time 7405 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3g2 d6a6 g2f2 a6f6 c3c2 f6c6 f2d2 c6c5 c2b2 f5g4 b2c2 c5c6 d2h2 g4f5 h2e2 c6a6
info depth 34 seldepth 60 multipv 1 score cp 909 nodes 655694098 nps 81553992 hashfull 79 tbhits 0 time 8040 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3h3 d6c5 c3c2 c5c6 h3d3 c6a6 d3e3 a6a8 e3e7 a8d5 e7e2 d5a5 c2b1 a5c5 b1b2 c5c6 b2c2 f5g6 e2d2
info depth 35 seldepth 50 multipv 1 score cp 909 nodes 662030918 nps 81581135 hashfull 80 tbhits 0 time 8115 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3h3 d6c5 c3b2 c5d5 h3h7 d5a5 h7a7 f5g4 a7d7 a5a6 b2c2 a6c6 d7d2 g4f5 c2b1 c6b7 d2d1 b7a6 d1d7
info depth 36 seldepth 50 multipv 1 score cp 910 nodes 708792396 nps 81554757 hashfull 85 tbhits 0 time 8691 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3h3 d6c5 c3b2 c5f2 b2c3 f2b6 c3c2 b6a6 h3h7 a6a5 h7h2 a5d5 c2c3 d5c5 c3c2 c5d4 h2e2 d4d7 e2e1 d7b5 e1e7

info 10 seconds
info depth 36 seldepth 50 multipv 1 score cp 910 nodes 813878834 nps 81371609 hashfull 98 tbhits 0 time 10002 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3h3 d6c5 c3b2 c5f2 b2c3 f2b6 c3c2 b6a6 h3h7 a6a5 h7h2 a5d5 c2c3 d5c5 c3c2 c5d4 h2e2 d4d7 e2e1 d7b5 e1e7
info depth 37 seldepth 75 multipv 1 score cp 930 nodes 1298203800 nps 81274888 hashfull 159 tbhits 0 time 15973 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3h3 d6c5 c3b2 c5a7 b2a2 a7a6 a2b3 c4c5 b3c2 c5c6 c2d2 c6c7 h3f3 a6e6 d2d1 e6d6 d1e2 d6b6 e2d3 b6b2
info depth 38 seldepth 72 multipv 1 score cp 930 nodes 1303094882 nps 81356988 hashfull 159 tbhits 0 time 16017 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3h3 d6c5 c3b2 c5c8 b2a2 c8a6 a2b2 a6b6 h3h2 c4c5 b2c2 c5c6 h2h8 b6c5 c2d3 c6c7 h8g8 c5d6 d3c3 d6e6 g8a8 e6b6 c3d3
info depth 39 seldepth 75 multipv 1 score cp 930 nodes 1331063519 nps 81655329 hashfull 162 tbhits 0 time 16301 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3h3 d6c5 c3b2 c5c8 b2a2 c8a6 a2b2 a6b6 h3h2 c4c5 h2e2 c5c6 e2c2 c6c7 b2b1 b6b8 c2c3 b8b7 b1b2 f5g6 c3e3 b7a6 e3e8 a6f6 b2c2 g6f5 e8c8 f6d6 c2b1 d6e5

info 20 seconds
info depth 39 seldepth 75 multipv 1 score cp 930 nodes 1640035495 nps 81993575 hashfull 196 tbhits 0 time 20002 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3h3 d6c5 c3b2 c5c8 b2a2 c8a6 a2b2 a6b6 h3h2 c4c5 h2e2 c5c6 e2c2 c6c7 b2b1 b6b8 c2c3 b8b7 b1b2 f5g6 c3e3 b7a6 e3e8 a6f6 b2c2 g6f5 e8c8 f6d6 c2b1 d6e5
info depth 40 seldepth 73 multipv 1 score cp 950 nodes 2061599193 nps 81660429 hashfull 247 tbhits 0 time 25246 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6c6 d7d8 d5d6 e7d6 c6a8 d8e7 a8b7 e7d8 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6f7 c7b6 f7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3g2 d6e5 c3b4 e5e1 b4a3 e1a5 a3b2 a5c5 b2b1 c5d4 g2a2 c4c5 a2c2 d4e4 b1b2 c5c6 c2c3 e4d4 b2b3 d4b6 b3c2 b6a6 c2b2 a6e2 b2a3 c6c7 c3c5 f5g4 c5c6
info depth 41 seldepth 78 multipv 1 score cp 950 nodes 2128348506 nps 82045738 hashfull 253 tbhits 0 time 25941 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6c6 d7d8 d5d6 e7d6 c6a8 d8e7 a8b7 e7d8 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6f7 c7b6 f7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3g2 d6e5 c3b4 e5e1 b4a3 e1a5 a3b2 a5c5 b2b1 c5d4 g2a2 c4c5 a2c2 d4e4 b1b2 c5c6 c2c3 e4d4 b2b3 d4b6 b3c2 b6a6 c2b2 a6e2 b2a3 c6c7 c3c5 f5g4 c5c6 e2b5 c6c2 b5a6 a3b2 c7c8r c2g2 g4f5 g2g3

info 30 seconds
info depth 41 seldepth 78 multipv 1 score cp 950 nodes 2480910022 nps 82688731 hashfull 293 tbhits 0 time 30003 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6c6 d7d8 d5d6 e7d6 c6a8 d8e7 a8b7 e7d8 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6f7 c7b6 f7f5 g2g3 d3e4 b6a5 f5d7 a5b4 d7d6 b4c3 e4f5 g3g2 d6e5 c3b4 e5e1 b4a3 e1a5 a3b2 a5c5 b2b1 c5d4 g2a2 c4c5 a2c2 d4e4 b1b2 c5c6 c2c3 e4d4 b2b3 d4b6 b3c2 b6a6 c2b2 a6e2 b2a3 c6c7 c3c5 f5g4 c5c6 e2b5 c6c2 b5a6 a3b2 c7c8r c2g2 g4f5 g2g3
info depth 42 seldepth 69 multipv 1 score cp 970 nodes 2671294219 nps 82597761 hashfull 308 tbhits 0 time 32341 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6c6 d7d8 d5d6 e7d6 c6a8 d8e7 a8b7 e7d8 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 g3g2 f5d7 b6a5 d7d6 a5b4 d6a6 g2h2 e4f5 b4c3 a6f6 c3d3 f6d6 d3e2 d6c5 e2f3 c5d5 f3e3 d5e4 e3d2 e4e5 h2h4 c4c5 h4h7 f5g4 h7a7 c5c6 a7a2 g4f5
info depth 43 seldepth 65 multipv 1 score cp 970 nodes 2671809333 nps 82600919 hashfull 308 tbhits 0 time 32346 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6a8 d8d7 a8b7 d7d8 b7b6 d8d7 b6c6 d7d8 d5d6 e7d6 c6a8 d8e7 a8b7 e7d8 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6h7 c7b6 h7f5 g2g3 d3e4 g3g2 f5d7 b6a5 d7d6 a5b4 d6a6 g2h2 e4f5 b4c3 a6f6 c3d3 f6d6 d3e2 d6c5 e2f3 c5d5 f3e3 d5e4 e3d2 e4e5 h2h4 c4c5 h4h7 f5g4 h7a7 c5c6 a7a2 g4f5 a2c2 e5d5 d2c1 d5h1 c1b2 h1e4

info 40 seconds
info depth 43 seldepth 77 multipv 1 score cp 991 nodes 3443628249 nps 86084249 hashfull 359 tbhits 0 time 40003 pv e6d6

info 50 seconds
info depth 43 seldepth 77 multipv 1 score cp 1075 nodes 4469551806 nps 89385672 hashfull 424 tbhits 0 time 50003 pv e6d6

info 60 seconds
info depth 43 seldepth 77 multipv 1 score cp 1180 nodes 5404160059 nps 90064831 hashfull 483 tbhits 0 time 60003 pv e6d6
info depth 44 seldepth 77 multipv 1 score cp 1235 nodes 5683345615 nps 90415629 hashfull 499 tbhits 0 time 62858 pv e6d6 e7d6 e1e8 h7d7 e8g6 b6b5 g2f1 d7e7 g6e6 e7h7 c4b5 a6b5 g5g6 h7h2 e6e2 h2g1 e2e7 c7c8 e7e8 c8c7 e8c6 c7d8 c6d6 d8c8 d6f8 c8b7 f8e7 b7a6 e7d6 a6a7 d6c7 a7a6 c7c6 a6a7 f1e2 g1d4 c6d7 a7a8 d7b5 c5c4 b5a4 a8b7 a4d7 b7b8 d7d8 b8b7 d8e7 b7a6 b3c4 a6b6 d5d6 b6a5 e7c7 d4b6 c7b6 a5b6 e2f1 b6a6 f1g2 a6a7 c2c3

info 70 seconds
info depth 44 seldepth 77 multipv 1 score cp 1235 nodes 6386949810 nps 91238229 hashfull 543 tbhits 0 time 70003 pv e6d6 e7d6 e1e8 h7d7 e8g6 b6b5 g2f1 d7e7 g6e6 e7h7 c4b5 a6b5 g5g6 h7h2 e6e2 h2g1 e2e7 c7c8 e7e8 c8c7 e8c6 c7d8 c6d6 d8c8 d6f8 c8b7 f8e7 b7a6 e7d6 a6a7 d6c7 a7a6 c7c6 a6a7 f1e2 g1d4 c6d7 a7a8 d7b5 c5c4 b5a4 a8b7 a4d7 b7b8 d7d8 b8b7 d8e7 b7a6 b3c4 a6b6 d5d6 b6a5 e7c7 d4b6 c7b6 a5b6 e2f1 b6a6 f1g2 a6a7 c2c3

info 80 seconds
info depth 44 seldepth 40 multipv 1 score cp 1210 nodes 7396772784 nps 92455037 hashfull 594 tbhits 0 time 80004 pv e6d6 e7d6

info 90 seconds
info depth 44 seldepth 40 multipv 1 score cp 1350 nodes 8626028202 nps 95840498 hashfull 625 tbhits 0 time 90004 pv e6d6

info 100 seconds
info depth 44 seldepth 40 multipv 1 score cp 1392 nodes 9784190920 nps 97837995 hashfull 659 tbhits 0 time 100004 pv e6d6

info 110 seconds
info depth 44 seldepth 40 multipv 1 score cp 1445 nodes 10881205762 nps 98916455 hashfull 689 tbhits 0 time 110004 pv e6d6
info depth 45 seldepth 62 multipv 1 score cp 1591 nodes 11509005203 nps 99802330 hashfull 702 tbhits 0 time 115318 pv e6d6 e7d6 e1e8 h7d7 e8g6 b6b5 g2f1 b5c4 f1c4 a6a5 g6e6 d7h7 c4e2 h7h2 e6e7 c7c8 e7e8 c8c7 e8c6 c7d8 c6d6 d8c8 d6e6 c8c7 e6e7 c7b6 e7d6 b6b7 d6c6 b7b8 c6b5 b8c7 b5a5 c7b8 a5b5 b8a8 b5c4 a8b7 g5g6 h2g2 c4b5 b7c7 b5c5 c7d8 c5b6 d8c8 b6e6 c8b8 e6d6 b8a7 d6a6 a7b8 a6b5 b8c7 b5c6 c7d8 c6f6 d8d7 f6e6 d7d8

info 120 seconds
info depth 45 seldepth 62 multipv 1 score cp 1591 nodes 11993719238 nps 99944328 hashfull 717 tbhits 0 time 120004 pv e6d6 e7d6 e1e8 h7d7 e8g6 b6b5 g2f1 b5c4 f1c4 a6a5 g6e6 d7h7 c4e2 h7h2 e6e7 c7c8 e7e8 c8c7 e8c6 c7d8 c6d6 d8c8 d6e6 c8c7 e6e7 c7b6 e7d6 b6b7 d6c6 b7b8 c6b5 b8c7 b5a5 c7b8 a5b5 b8a8 b5c4 a8b7 g5g6 h2g2 c4b5 b7c7 b5c5 c7d8 c5b6 d8c8 b6e6 c8b8 e6d6 b8a7 d6a6 a7b8 a6b5 b8c7 b5c6 c7d8 c6f6 d8d7 f6e6 d7d8

info 3 minutes
info depth 45 seldepth 74 multipv 1 score cp 1921 nodes 19219175966 nps 106770827 hashfull 832 tbhits 0 time 180004 pv e6d6

info 4 minutes
info depth 45 seldepth 94 multipv 1 score cp 2562 nodes 26190025512 nps 109123287 hashfull 906 tbhits 0 time 240004 pv e6d6

info 5 minutes
info depth 45 seldepth 94 multipv 1 score cp 2893 nodes 33328424167 nps 111093265 hashfull 944 tbhits 0 time 300004 pv e6d6
info depth 46 seldepth 94 multipv 1 score cp 3039 nodes 34933128391 nps 111718086 hashfull 948 tbhits 0 time 312690 pv e6d6 e7d6 e1e8 h7d7 e8g6 b6b5 g2f1 b5c4 f1c4 a6a5 g6e6 d7h7 c4e2 h7h2 e6e7 c7b8 e7d6 b8a8 d6a6 a8b8 a6b6 b8a8 b6a5 a8b8 a5d8 b8b7 d8e7 b7b6 e7e5 c5c4 e5d4 b6c7 d4c4 c7d7 c4b5 d7c7 g5g6 c7d8 b5b8 d8d7 b8e5 h2g2 e5e6 d7c7 d5d6 c7c6 b3b4 g2f2 b4b5 c6c5 e6e5 c5b6 d6d7 b6b7 g6g7 f2b6 g7g8q b7a7 e5e7 b6c7 c2b3
info depth 47 seldepth 81 multipv 1 score cp 3381 nodes 37379967484 nps 111881902 hashfull 958 tbhits 0 time 334102 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6f5 g2g3 d3e2 c7b8 f5f7 g3g2 e2e3 a6a5 f7e8 b8c7 e8e7 c7c8 e7d6 a5a4 d6c5 c8d7 c5b5 d7e6 b5a6 e6e7 a6a4 g2g1 a4a5 e7e8 e3f3 g1c1 g5g6 c1f1 f3e3 f1g1 a5b6 g1c1 b6f6 e8d7 g6g7 c1e1 e3d3 d7c7 f6f8 e1g1 f8c5 c7d7 c5b5 d7c8 b5a6 c8d7

info 6 minutes
info depth 47 seldepth 70 multipv 1 score cp 4380 nodes 39710162075 nps 110304780 hashfull 973 tbhits 0 time 360004 pv e6d6
info depth 48 seldepth 76 multipv 1 score cp 6156 nodes 42375331537 nps 107727411 hashfull 987 tbhits 0 time 393357 pv e6d6 e7d6 e1e8 h7d7 e8g6 c7b7 g6e6 d7g7 e6d6 b7a7 d6d8 b6b5 d8d6 g7b7 d6f6 b7d7 f6f8 d7b7 c4b5 c5c4 f8c5 a7a8 c5c4 a8b8 b5a6 b7b6 g2f1 b6f2 f1e2 f2b6 g5g6 b8a7 c4b5 b6b5 e2b5 a7b6 b5c4 b6c5 d5d6 c5c6 c2c3 c6d7 a6a7

info 7 minutes
info depth 48 seldepth 79 multipv 1 score cp 7638 nodes 44622443379 nps 106242900 hashfull 993 tbhits 0 time 420004 pv e6d6

info depth 49 seldepth 79 multipv 1 score mate 30 nodes 47449842398 nps 106929945 hashfull 995 tbhits 0 time 443747 pv e6d6 e7d6 e1e8 h7d7 e8g6 d7e7 g6e6 e7g7 e6e8 g7d4 e8c6 c7d8 c6d6 d8e8 d6e6 e8d8 e6b6 d8d7 b6c6 d7e7 c6e6 e7d8 e6d6 d8c8 d6a6 c8b8 a6b6 b8c8 b6c6 c8b8 c6e8 b8c7 d5d6 d4d6 g2d5 d6a6 e8e7 c7c8 d5e6 c8b8 e7d8 b8a7 d8c7 a6b7 c7b7 a7b7 g5g6 b7b6 g6g7 b6c6 g7g8q c6c7 g8c8 c7b6 e6f5 b6a7 c8c7 a7a6 f5c8

info depth 50 seldepth 60 multipv 1 score mate 29 nodes 47980386614 nps 106942006 hashfull 995 tbhits 0 time 448658 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 g2g3 d3e2 g3g2 e2f1 g2d2 f1e1 d2d3 e1e2 d3h3 g6d6 d8c8 d6c5 c8b7 c5f5 h3h2 e2e3 b7b6 g5g6 h2h1 g6g7 h1g1 f5f7 a6a5 g7g8q g1g8 f7g8 b6c7 g8d5 a5a4 b3a4 c7b8 d5d7 b8a8 e3d4 a8b8 d4d5 b8a8 d5c6 a8b8 d7b7

info depth 51 seldepth 56 multipv 1 score mate 28 nodes 48218044478 nps 106942315 hashfull 995 tbhits 0 time 450879 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6f5 a6a5 f5f7 c7b6 f7d7 g2g1 d7d6 b6b7 d6d7 b7b8 d7b5 b8a8 b5a5 a8b7 a5b5 b7a8 b5c5 g1b1 d3c2 b1a1 c5d5 a8a7 d5d4 a7b8 d4a1 b8b7 a1g7 b7c6 g7e7 c6b6 e7d7 b6c5 d7c7 c5b4 c7b6 b4a3 b6a5

info depth 52 seldepth 60 multipv 1 score mate 27 nodes 48545266167 nps 106950514 hashfull 995 tbhits 0 time 453904 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6f5 a6a5 f5f7 c7b6 f7d7 g2g3 d3e4 d6d5 d7d5 a5a4 d5d6 b6b7 b3a4 g3g2 g5g6 g2g3 d6d7 b7a6 g6g7 a6b6 g7g8q g3g8 d7e6 b6c7 e6g8 c7b6 g8b8 b6c6 b8d8 c6b7 e4d5 b7a7 d5c6 a7a6 d8b6

info depth 53 seldepth 54 multipv 1 score mate 27 nodes 48656996195 nps 106948325 hashfull 995 tbhits 0 time 454958 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6f5 a6a5 f5f7 c7b6 f7d7 g2g3 d3e4 d6d5 d7d5 a5a4 d5d6 b6b7 b3a4 g3g2 g5g6 g2g3 d6d7 b7a6 g6g7 a6b6 g7g8q g3g8 d7e6 b6c7 e6g8 c7b6 g8b8 b6c6 b8d8 c6b7 e4d5 b7a7 d5c6 a7a6 d8b6

info depth 54 seldepth 54 multipv 1 score mate 26 nodes 49271111470 nps 106919586 hashfull 995 tbhits 0 time 460824 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6b7 d7d8 d5d6 e7d6 b7h7 e8e2 c2d3 e2g2 h7g6 d8c7 g6f5 a6a5 f5f7 c7b6 f7d7 g2g3 d3e4 d6d5 d7d5 a5a4 d5d6 b6b7 e4d5 g3d3 d5c5 d3d6 c5d6 a4b3 a2b3 b7b6 g5g6 b6a6 g6g7 a6a5 d6c5 a5a6 g7g8q a6b7 g8g7 b7c8 c5c6 c8b8 g7b7

[peter]

info depth 102 seldepth 48 multipv 1 score mate 24 nodes 658978732140 nps 63945545 hashfull 1000 tbhits 4935556594 time 10305311 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6a7 d7d8 d5d6 e7d6 a7h7 e8e2 c2c3 e2g2 h7g6 d8c7 g6f5 a6a5 g5g6 g2g3 f5d3 g3g2 f4f5 a5a4 f5f6 d6d5 d3d5 g2g3 c3d2 a4b3 f6f7 b3b2 f7f8q b2b1n d2c1 g3g1 c1b2 g1g2 d5g2 b1d2 f8c5 c7b8 c5b6 b8c8 g2h3

Best way is always to wait for your machine's output-line, Louis, and then run a Backward of it

4r3/2k1p2q/pp1nR1p1/2pP1pP1/2P2P2/1P6/P1K3B1/4Q3 w - - 0 1

Analysis by Cfish 030820 64 POPCNT NUMA:

1.Rxd6 Kxd6 2.Qe6+ Kc7 3.Qc6+ Kd8 4.Qxb6+ Kd7 5.Qb7+ Kd8 6.d6 exd6 7.Qxh7 Re2+ 8.Kc3 Rxg2 9.Qxg6 Rg3+ 10.Kb2 Rd3 11.Qxf5 Re3 12.g6 Kc7 13.Qf7+ Kc6 14.g7 Rg3 15.g8Q Rxg8 16.Qxg8 Kb6 17.Qb8+ Kc6 18.f5 a5 19.f6 d5 20.a3 dxc4 21.bxc4 a4 22.f7 Kd7 23.f8Q Kc6 24.Qfd6#
+- (#24) Depth: 84/48 00:01:52 3441MN
...
1.Rxd6 Kxd6 2.Qe6+ Kc7 3.Qc6+ Kd8 4.Qxb6+ Kd7 5.Qb7+ Kd8 6.d6 exd6 7.Qxh7 Re2+ 8.Kc3 Rxg2 9.Qxg6 Rg3+ 10.Kb2 Rd3 11.Qxf5 Re3 12.g6 Kc7 13.Qf7+ Kc6 14.g7 Rg3 15.g8Q Rxg8 16.Qxg8 Kc7 17.f5 a5 18.Ka3 d5 19.f6 dxc4 20.f7 cxb3 21.f8Q Kc6 22.Qf6+ Kb7 23.Qh7+ Ka8 24.Qd8#
+- (#24) Depth: 92/48 00:09:36 18294MN
...
1.Rxd6 Kxd6 2.Qe6+ Kc7 3.Qc6+ Kd8 4.Qxb6+ Kd7 5.Qb7+ Kd8 6.d6 exd6 7.Qxh7 Re2+ 8.Kc3 Rxg2 9.Qxg6 Rg3+ 10.Kb2 Rd3 11.Qxf5 Re3 12.g6 Kc7 13.Qf7+ Kc6 14.g7 Rg3 15.g8Q Rxg8 16.Qxg8 Kc7 17.Ka3 Kd7 18.f5 d5 19.Qe6+ Kd8 20.f6 Kc7 21.f7 dxc4 22.f8Q Kb7 23.Qfc8+ Ka7 24.Qexa6#
+- (#24) Depth: 101/48 00:34:09 64125MN

[zullil]

info depth 102 seldepth 48 multipv 1 score mate 24 nodes 658978732140 nps 63945545 hashfull 1000 tbhits 4935556594 time 10305311 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6a7 d7d8 d5d6 e7d6 a7h7 e8e2 c2c3 e2g2 h7g6 d8c7 g6f5 a6a5 g5g6 g2g3 f5d3 g3g2 f4f5 a5a4 f5f6 d6d5 d3d5 g2g3 c3d2 a4b3 f6f7 b3b2 f7f8q b2b1n d2c1 g3g1 c1b2 g1g2 d5g2 b1d2 f8c5 c7b8 c5b6 b8c8 g2h3

Best way is always to wait for your machine's output-line, Louis, and then run a Backward of it

4r3/2k1p2q/pp1nR1p1/2pP1pP1/2P2P2/1P6/P1K3B1/4Q3 w - - 0 1

Analysis by Cfish 030820 64 POPCNT NUMA:

1.Rxd6 Kxd6 2.Qe6+ Kc7 3.Qc6+ Kd8 4.Qxb6+ Kd7 5.Qb7+ Kd8 6.d6 exd6 7.Qxh7 Re2+ 8.Kc3 Rxg2 9.Qxg6 Rg3+ 10.Kb2 Rd3 11.Qxf5 Re3 12.g6 Kc7 13.Qf7+ Kc6 14.g7 Rg3 15.g8Q Rxg8 16.Qxg8 Kb6 17.Qb8+ Kc6 18.f5 a5 19.f6 d5 20.a3 dxc4 21.bxc4 a4 22.f7 Kd7 23.f8Q Kc6 24.Qfd6#
+- (#24) Depth: 84/48 00:01:52 3441MN
...
1.Rxd6 Kxd6 2.Qe6+ Kc7 3.Qc6+ Kd8 4.Qxb6+ Kd7 5.Qb7+ Kd8 6.d6 exd6 7.Qxh7 Re2+ 8.Kc3 Rxg2 9.Qxg6 Rg3+ 10.Kb2 Rd3 11.Qxf5 Re3 12.g6 Kc7 13.Qf7+ Kc6 14.g7 Rg3 15.g8Q Rxg8 16.Qxg8 Kc7 17.f5 a5 18.Ka3 d5 19.f6 dxc4 20.f7 cxb3 21.f8Q Kc6 22.Qf6+ Kb7 23.Qh7+ Ka8 24.Qd8#
+- (#24) Depth: 92/48 00:09:36 18294MN
...
1.Rxd6 Kxd6 2.Qe6+ Kc7 3.Qc6+ Kd8 4.Qxb6+ Kd7 5.Qb7+ Kd8 6.d6 exd6 7.Qxh7 Re2+ 8.Kc3 Rxg2 9.Qxg6 Rg3+ 10.Kb2 Rd3 11.Qxf5 Re3 12.g6 Kc7 13.Qf7+ Kc6 14.g7 Rg3 15.g8Q Rxg8 16.Qxg8 Kc7 17.Ka3 Kd7 18.f5 d5 19.Qe6+ Kd8 20.f6 Kc7 21.f7 dxc4 22.f8Q Kb7 23.Qfc8+ Ka7 24.Qexa6#
+- (#24) Depth: 101/48 00:34:09 64125MN

OK, Peter. So I think I'll stop that search now. Last iteration gives:

info depth 113 seldepth 48 multipv 1 score mate 24 nodes 906300720280 nps 62711826 hashfull 1000 tbhits 8141434865 time 14451831 pv e6d6 c7d6 e1e6 d6c7 e6c6 c7d8 c6b6 d8d7 b6a7 d7d8 d5d6 e7d6 a7h7 e8e2 c2c3 e2g2 h7g6 d8c7 g6f5 a6a5 g5g6 g2g3 f5d3 g3g2 f4f5 a5a4 f5f6 d6d5 d3d5 g2g3 c3d2 a4b3 f6f7 b3b2 f7f8q b2b1n d2c1 g3g1 c1b2 g1g2 d5g2 b1d2 f8c5 c7b8 c5b6 b8c8 g2h3

[Dann Corbit]

So we all surrendered on the mate in 20, I think

[peter]

So we all surrendered on the mate in 20, I think

http://talkchess.com/forum3/viewtopic.p ... 98#p854998

[MOBMAT]

So we all surrendered on the mate in 20, I think

not quite yet! LOL
but i don't think i have the hardware to solve it.

[peter]

So we all surrendered on the mate in 20, I think

not quite yet! LOL
but i don't think i have the hardware to solve it.

Hasn't really anybody seen Louis' engine- output here at all?

http://talkchess.com/forum3/viewtopic.p ... 98#p854998

I wonder, if he'll go on spending all this hardware- time if not even the thread- author's seem to care.

BTW to reproduce such output- lines, if you already have them, by letting an engine run a Backward on them with enough hash used, costs by far less hardware- time than standalone computing does.

But as far as I understand, the "competition" seems to be a very special one in this respect too, that the engine isn't allowed to "solve" the given "test" other than by pondering from empty hash, isn't it? That's not a tag- question only, I really am not sure about that point, am I?

[MOBMAT]

So we all surrendered on the mate in 20, I think

not quite yet! LOL
but i don't think i have the hardware to solve it.

Hasn't really anybody seen Louis' engine- output here at all?

http://talkchess.com/forum3/viewtopic.p ... 98#p854998

I wonder, if he'll go on spending all this hardware- time if not even the thread- author's seem to care.

BTW to reproduce such output- lines, if you already have them, by letting an engine run a Backward on them with enough hash used, costs by far less hardware- time than standalone computing does.

But as far as I understand, the "competition" seems to be a very special one in this respect too, that the engine isn't allowed to "solve" the given "test" other than by pondering from empty hash, isn't it? That's not a tag- question only, I really am not sure about that point, am I?

Well, one responded said Cfish had a solution but there hasn't been another engine. I tried H6 (Nalimov) again but every time I do, something happens (power went out, windows decided to reboot, etc.). I haven't given up on trying to solve it, but as I said, my PC might not have the teeth (RAM, mostly).

[Dicaste]

Code: Select all

New game Line
4r3/2k1p2q/pp1nR1p1/2pP1pP1/2P2P2/1P6/P1K3B1/4Q3 w - - 0 1

Analysis by Stockfish 100820 DarkHorse:

1.Rxd6 Kxd6 2.Qe6+ Kc7 3.Qc6+ Kd8 4.Qxb6+ Kd7 5.Qa7+ Kd8 6.d6 
  White is clearly better: +- (2.20)  Depth: 10/22   00:00:00
1.Rxd6 exd6 2.Qxe8 Kb7 3.Qc6+ Ka7 4.Qxd6 Qb7 5.Kd3 a5 6.Qc6 
  White is clearly better: +- (2.47)  Depth: 11/22   00:00:00
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 b5 4.Qe6 b4 5.Qxd7+ Kxd7 6.Bf1 a5 7.Bh3 Kc8 8.Bxf5+ Kd8 9.g6 
  White is clearly better: +- (2.34)  Depth: 12/22   00:00:00
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 b5 4.Bh3 b4 5.Bxf5 Qd8 6.Qf7+ Kb8 7.g6 Qa5 8.g7 
  White has a decisive advantage: +- (2.51)  Depth: 13/22   00:00:00  247kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 b5 4.Bh3 b4 5.Bxf5 Qe7 6.Qe6 Qf8 7.Kd2 a5 8.Qd7+ Kb8 9.Qb5+ Ka7 10.Qxa5+ Kb7 
  White has a decisive advantage: +- (2.55)  Depth: 14/24   00:00:00  464kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 b5 7.Qc6+ Kd8 8.Qxd7+ Kxd7 9.cxb5 axb5 10.Bh3 b4 11.Bxf5+ Kd8 12.Kd3 
  White has a decisive advantage: +- (2.60)  Depth: 15/26   00:00:00  966kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Kb7 4.Qe6 Qd8 5.Qxf5 b5 6.cxb5 axb5 7.Qf6 Qd7 8.Bf1 b4 9.f5 Qh7 10.g6 Qd7 
  White has a decisive advantage: +- (2.55)  Depth: 16/30   00:00:00  1307kN
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Qa8+ Kc7 10.Kd2 Qd8 11.Qc6+ Kb8 
  White has a decisive advantage: +- (2.62)  Depth: 17/31   00:00:00  1576kN, tb=2
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 a5 7.Qc6+ Kd8 8.Bh3 Ke7 9.Qxd7+ Kxd7 10.Bxf5+ Ke8 11.Bd3 Ke7 12.Kd1 Kd8 13.f5 Ke7 
  White has a decisive advantage: +- (2.66)  Depth: 18/39   00:00:00  2150kN, tb=2
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qh4 6.Qc6+ Kd8 7.Qxd6+ Ke8 8.Qe6+ Kd8 9.Qxb6+ Kd7 10.Qe6+ Kd8 11.Qd6+ Ke8 12.Qe5+ Kd8 13.Qxf5 Qf2+ 14.Kd3 Qg3+ 15.Ke4 Qxg2+ 16.Ke5 Qf3 17.d6 
  White has a decisive advantage: +- (2.69)  Depth: 19/39   00:00:00  3252kN, tb=2
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 Qc7 10.Qxc7+ Kxc7 11.g6 b5 12.g7 a4 13.bxa4 b4 14.g8Q Kd7 15.Qf7+ Kd8 16.Qxf5 
  White has a decisive advantage: +- (2.84)  Depth: 20/39   00:00:00  5804kN, tb=4
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qg7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 Qc7 10.Qxc7+ Kxc7 11.g6 b5 12.g7 a4 13.g8Q b4 14.Qf7+ Kd8 15.bxa4 Kc8 16.Qe8+ Kb7 17.Qc6+ Ka7 18.Qxd6 
  White has a decisive advantage: +- (2.91)  Depth: 21/39   00:00:01  8937kN, tb=10
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 Qc7 10.Qxc7+ Kxc7 11.g6 Kb8 12.g7 Kb7 13.g8Q Kc7 14.Qe6 a4 15.Qe7+ Kb8 
  White has a decisive advantage: +- (3.04)  Depth: 22/39   00:00:02  15255kN, tb=17
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 b5 10.cxb5 Qc7 11.b6 Qb8 12.Bh5 Ke7 13.b7 Kf8 14.Qc8+ Qxc8 15.bxc8Q+ Kg7 16.Qxf5 
  White has a decisive advantage: +- (3.12)  Depth: 23/46   00:00:02  19709kN, tb=31
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 b5 10.cxb5 Qc7 11.b6 Qb8 12.Bh5 Ke7 13.b7 Kf8 14.Qc8+ Qxc8 15.bxc8Q+ Kg7 16.Qxf5 
  White has a decisive advantage: +- (3.20 ++)  Depth: 24/46   00:00:03  27005kN, tb=62
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kd8 8.Bf3 a5 9.Kd2 b5 10.cxb5 Qc7 11.b6 Qb8 12.Bh5 Ke7 13.b7 Kf8 14.Qc8+ Qxc8 15.bxc8Q+ Kg7 16.Qxf5 
  White has a decisive advantage: +- (3.28 ++)  Depth: 24/46   00:00:04  33291kN, tb=91
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kb8 8.Qxb6+ Kc8 9.Qxa6+ Kb8 10.Kd3 Qd8 11.Bh3 Qe7 12.Qb6+ Ka8 13.Qc6+ Kb8 14.Bxf5 Qd8 15.Qa6 Qe7 16.Qc8+ Ka7 17.Qd7+ Qxd7 
  White has a decisive advantage: +- (3.31)  Depth: 24/46   00:00:04  38126kN, tb=126
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qh7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kb8 8.Qxb6+ Kc8 9.Qxa6+ Kb8 10.Kd3 Qd8 11.Bh3 Qe7 12.Qb6+ Ka8 13.Qc6+ Kb8 14.Bxf5 Qd8 15.Qa6 Qe7 16.Qc8+ Ka7 17.Qd7+ Qxd7 
  White has a decisive advantage: +- (3.39 ++)  Depth: 25/40   00:00:05  50596kN, tb=232
1.Rxd6 exd6 2.Qxe8 Qd7 3.Qxg6 Qe7 4.Qe6 Qg7 5.Qe8 Qd7 6.Qa8 Qe7 7.Qc6+ Kb8 8.Qxb6+ Kc8 9.Qxa6+ Kb8 10.Kd3 Qd8 11.Bh3 Qf8 12.Qb5+ Ka8 13.Qa4+ Kb8 14.Qa6 Qh8 15.Qxd6+ Kb7 16.Qc6+ Kb8 17.Bxf5 Qd4+ 18.Ke2 Qb2+ 19.Kf3 Qd4 20.Qd6+ Ka8 
  White has a decisive advantage: +- (3.46)  Depth: 25/42   00:00:07  64500kN, tb=283

(,  12.08.2020)

It finds instantly.