McBrain solves a hard one quickly

[Dann Corbit]

This position:
3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P4P/PPB1K3/8 w - -

as described here:
http://www.yacpdb.org/#search/M0I0MXIyc ... MS8xLzA=/1

is solved quickly by McBrain (correct plan in 388 seconds):

Code: Select all

F:\project\dcorbit\McBrain\src>McBrain-95-mingw.exe
McBrain 9.5 64 POPCNT by M. Byrne, I. Ivec, Stockfish authors and others
setoption name SyzygyPath value c:\chess\syzygy;
info string Found 510 tablebases
bench 4096 11 900000 X:\users\dcorbit\pennies.epd movetime

Position: 1/1
info depth 1 seldepth 1 multipv 1 score cp -705 nodes 6791 nps 1358200 tbhits 0 time 5 pv c2d3 c5c4
info depth 2 seldepth 3 multipv 1 score cp -725 nodes 12846 nps 917571 tbhits 0 time 14 pv d8a5 b5a5
info depth 3 seldepth 4 multipv 1 score cp -746 nodes 22004 nps 1100200 tbhits 0 time 20 pv d8a5 b5a5 e5f6 e7f6
info depth 4 seldepth 8 multipv 1 score cp -747 nodes 32400 nps 1080000 tbhits 0 time 30 pv d8a5 b5a5 e5f6 e7f6 b2a3
info depth 5 seldepth 7 multipv 1 score cp -746 nodes 84782 nps 2422342 tbhits 0 time 35 pv d8a5 a6a5 e5f6 a3b2 c3b4 b5b4 f4g5
info depth 6 seldepth 9 multipv 1 score cp -758 nodes 171467 nps 4182121 tbhits 0 time 41 pv d8a5 a6a5 c3b4 b5b4 b2a3 a5a3 d4c5 d6e5
info depth 7 seldepth 10 multipv 1 score cp -767 nodes 209987 nps 4772431 tbhits 0 time 44 pv d8a5 a6a5 c3b4 b5b4 e5f6 a3b2 f6f7 b7b8 f4g5 c5d4
info depth 8 seldepth 19 multipv 1 score cp -668 nodes 886175 nps 10070170 tbhits 0 time 88 pv e5f6 e7e6 d8e7 b4b3 c2b1 b3a2 b1a2 b5c6 f6f7 a6a8 f7f8q a8f8 e7f8
info depth 9 seldepth 23 multipv 1 score cp -672 nodes 1254835 nps 10911608 tbhits 0 time 115 pv e5f6 e7e6 d8e7 b4b3 c2b1 b5c6 f6f7 b3a2 b1a2 a6a8 f7f8q a8f8 e7f8 b7b2 e2d3 b2a2 f8e7 g5f4
info depth 10 seldepth 24 multipv 1 score cp -663 nodes 2269616 nps 12008550 tbhits 0 time 189 pv e5f6 e7e6 c3c4 b5c4 d8e7 a3b2 f6f7 a6a8 f7f8r a8f8 e7f8 g5f4 f8d6 c4c3 c2b1 c5d4
info depth 11 seldepth 17 multipv 1 score cp -710 nodes 2401691 nps 12068798 tbhits 0 time 199 pv e5f6 e7e5 d8a5 a6a5 c3b4 b5b4 f4g5 a3b2 d4e5 d6e5 e2d3 b7f7 d3e2 a5a2
info depth 12 seldepth 22 multipv 1 score cp -741 nodes 3562536 nps 12768946 tbhits 0 time 279 pv e5f6 e7e5 d8e7 b4b3 c3c4 b5b6 c2b3 a3b2 b3c2 e5f4 e7d8 b6a7 f6f7 b7f7 d8g5 c5d4 g5h4
info depth 13 seldepth 29 multipv 1 score cp -733 nodes 4052244 nps 12864266 tbhits 0 time 315 pv e5f6 e7e5 d8e7 b4b3 c3c4 b5b6 c2b1 b3a2 b1a2 e5f4 b2b3 c5d4 e2d3 b6c6 d3d4 c6d7 d4e4 a5c3
info depth 14 seldepth 23 multipv 1 score cp -741 nodes 4527581 nps 12789776 tbhits 0 time 354 pv e5f6 e7e5 d8e7 b4b3 c3c4 b5b6 c2b1 b3a2 b1a2 e5f4 b2a3 a5c3 e2d1 a6a8 d4c5 b6c5 d1c1 a8a3
info depth 15 seldepth 33 multipv 1 score cp -747 nodes 7129201 nps 13129283 tbhits 0 time 543 pv e5f6 e7e5 d8e7 b4b3 c2b1 e5f4 a2b3 a3b2 e2d3 a6a8 e7d6 f4f3 d6c5 a5b6 d3e3 b6c5 b1d3 b5a5 d4c5 b7b3 d3b1 b3c3 e3d4
info depth 16 seldepth 33 multipv 1 score cp -737 nodes 9140597 nps 13189894 tbhits 2 time 693 pv e5f6 e7e5 d8e7 b4b3 c3c4 b5c4 a2b3 c4d4 b2a3 e5f4 e2d1 a6a8 e7d6 a5d8 b3b4 c5b4 a3b4 d8f6
info depth 17 seldepth 31 multipv 1 score cp -764 nodes 11960671 nps 13469224 tbhits 5 time 888 pv e5f6 e7e5 d8e7 b4b3 c3c4 b5c4 c2b3 c4d4 b2a3 e5f4 e2f3 a6a8 e7d6 a5d8 f6f7 d8e7 d6e7 b7e7 a3a4 c5c4 b3c2 e7e3 f3f2
info depth 18 seldepth 30 multipv 1 score cp -774 nodes 17509739 nps 14075352 hashfull 36 tbhits 6 time 1244 pv e5f6 e7e5 d8a5 b4b3 c2b3 a3b2 b3c2 a6a5 d4e5 a5a2 e2d3 c5c4 d3e4 d6e5 f4g5 a2a1 g5g6 b2b1q c2b1 a1b1 e4e5 b1c1
info depth 19 seldepth 40 multipv 1 score cp -812 nodes 29285901 nps 14505151 hashfull 59 tbhits 38 time 2019 pv e5f6 e7e5 d8e7 b4b3 c3c4 b5c4 a2b3 c4d4 b2a3 e5f4 c2e4 d4e4 f6f7 a6a8 f7f8q a8f8 e7f8 b7b3 f8e7 b3a3 e7g5 a3h3 g5e7 e4d5 e2f2 d5c6 e7g5 h3g3
info depth 20 seldepth 47 multipv 1 score cp -832 nodes 49356602 nps 14861969 hashfull 87 tbhits 85 time 3321 pv e5f6 e7e5 d8a5 b4b3 c2b3 a3b2 b3c2 a6a5 f4g5 a5a2 e2d3 c5c4 d3e3 a2a1 g5g6 a1c1 e3d2 e5d4 c3d4 b5a5 c2f5 c4c3 d2e2 b2b1q f5b1 b7b1 e2d3 b1b2 d3c4 c3c2 c4c3
info depth 21 seldepth 47 multipv 1 score cp -744 nodes 128343835 nps 15262675 hashfull 220 tbhits 567 time 8409 pv e5f6 e7f6 c3c4 b5c4 c2d3 c4d5 d3a6 b7a7 d8f6 a3b2 a6d3 c5c4 d3c2 g5f4 f6h4 a5b6 e2f3 b6d4 g4g5 a7a2 h4e1 a2a1 e1b4 a1f1 f3e2 f1f2 e2d1 f4f3 d1e1 f2c2
info depth 22 seldepth 48 multipv 1 score cp -855 nodes 171532339 nps 15396493 hashfull 287 tbhits 1398 time 11141 pv e5f6 e7f6 c3c4 b5c4 c2d3 c4d5 d3a6 b7a7 d8f6 a3b2 a6d3 c5c4 d3b1 g5f4 f6h4 a5b6 e2f3 b6d4 h4e1 c4c3 g4g5 a7e7 e1f2 d4f2 f3f2 d5d4 h3h4 e7e3 b1f5 d4e5 f5c2 e3h3 g5g6 h3h2 f2f3 h2c2
info depth 23 seldepth 50 multipv 1 score cp -900 nodes 215345799 nps 15431443 hashfull 339 tbhits 2626 time 13955 pv e5f6 e7f6 c3c4 b5c4 c2d3 c4d5 d3a6 b7a7 d8f6 a3b2 a6d3 c5c4 d3b1 g5f4 e2f3 a5b6 b1e4 d5e6 g4g5 a7a2 e4g6 a2a3 f3f4 c4c3 d4d5 e6d5 g6e4 d5e6 e4f5 e6f7 f5d3 a3a1 f4f5 a1f1 f5e4 f1d1 d3c2
info depth 24 seldepth 61 multipv 1 score cp -921 nodes 308919620 nps 15511127 hashfull 453 tbhits 6955 time 19916 pv e5f6 e7f6 c3c4 b5c4 c2d3 c4d5 d3a6 b7a7 b2a3 a5d8 a6b5 a7a3 f4g5 f6g5 d4c5 a3a2 e2d3 a2a3 d3e2 d6c5 b5e8 a3h3 e8f7 d5d6 e2f2 b4b3 f2g2 h3g3 g2f2 b3b2 f7a2 g3g4 f2f3
info depth 25 seldepth 56 multipv 1 score cp -994 nodes 540775873 nps 15717487 hashfull 664 tbhits 23720 time 34406 pv e5f6 e7f6 c3c4 b5c4 c2d3 c4d5 d3a6 b7a7 d8f6 a3b2 a6d3 c5c4 d3c2 g5f4 e2f3 a5b6 c2e4 d5e6 g4g5 a7a2 d4d5 e6f7 f6h8 c4c3 e4f5 a2a1 g5g6 f7g8 h8f6 a1e1 g6g7 e1f1 f3e2 f1g1 f5e6 g8h7 e6f5 h7h6 f5c2 g1g3 f6h4 f4f3 e2d3
info depth 26 seldepth 55 multipv 1 score cp -1010 nodes 665517431 nps 15684328 hashfull 774 tbhits 35872 time 42432 pv e5f6 e7f6 c3c4 b5c4 c2d3 c4d5 d3a6 b7a7 d8f6 a3b2 a6d3 c5c4 d3b1 g5f4 f6h4 a5b6 h4g5 a7a3 g5f4 a3h3 g4g5 b6d4 g5g6 h3h1 b1f5 h1c1 f4h6 c4c3 g6g7 c1g1 g7g8q g1g8 f5c2 g8g2 e2d3 g2g3 d3e2 d5e5 c2b1 g3h3 h6g5 d6d5
info depth 27 seldepth 59 multipv 1 score cp -1065 nodes 1206312299 nps 15891558 hashfull 928 tbhits 84061 time 75909 pv e5f6 e7f6 c3c4 b5c4 c2d3 c4d5 d3a6 b7a7 d8f6 a3b2 a6d3 c5c4 d3f5 g5f4 e2f3 a5b6 f5e4 d5e6 f6h8 a7a2 f3f4 c4c3 d4d5 e6f7 f4f3 a2a1 f3e2 a1h1 g4g5 h1h3 e4f5 h3e3 e2d1 e3f3 f5e4 f3f4 e4d3 f4f1 d1e2 f1f2 e2e1 h4h3 g5g6 f7g8
info depth 28 seldepth 57 multipv 1 score cp -1112 nodes 1803876555 nps 16147996 hashfull 990 tbhits 177044 time 111709 pv e5f6 e7f6 d8f6 b4b3 c2b1 b3a2 b1a2 a3b2 c3c4 b5a4 a2b1 b7b3 f4g5 b3h3 d4c5 h3h1 b1c2 a4a3 e2f3 d6c5 f6b2 a3b2 c2f5 b2b3 g5g6 a5c3 f3g2 h1c1 g4g5 b3c4 g2h3 c1h1 h3g2 h1d1 f5e4 a6a2 g2f3
info depth 29 seldepth 61 multipv 1 score cp -1179 nodes 3257889036 nps 16275692 hashfull 999 tbhits 458183 time 200169 pv e5f6 e7f6 c3c4 b5c4 c2d3 c4d5 d3a6 b7a7 d8f6 a3b2 a6d3 c5c4 d3b1 g5f4 f6h4 a5b6 h4g5 a7a3 g5f4 a3h3 g4g5 b6d4 g5g6 h3h1 b1f5 h1c1 f4h6 c4c3 g6g7 c1g1 g7g8q g1g8 e2f3 g8e8 f5h7 e8e7 h7d3 e7e1 h6f4 e1f1 f3g4 f1d1 d3h7 d1c1 f4g5 c1g1 g4f4 d4e5 f4e3 g1g3 e3e2 g3g5
info depth 30 seldepth 59 multipv 1 score cp -1199 nodes 4673733998 nps 16472644 hashfull 999 tbhits 801970 time 283727 pv e5f6 e7f6 d8f6 b4b3 c2b1 b3a2 b1a2 a3b2 c3c4 b5a4 a2b1 b7b3 e2f2 b3h3 d4d5 g5f4 b1c2 a4a3 f2g2 h3e3 c2f5 e3e1 f6h4 b2b1q f5b1 e1b1 h4g5 a3b4 g5f4 b4c4 g4g5 c4d5 g2f3 a5b6 f3g3 d5c6
info depth 31 seldepth 58 multipv 1 score cp -1232 nodes 6423381398 nps 16544531 hashfull 999 tbhits 1116041 time 388248 pv c2a4 b5a4 b2b3 a4b5 c3c4 b5c6 d4d5 c6d7 d8a5 f6e5 f4f5 a6a5 e2f2 a5a8 f2f3 a8g8 f3f2 g8f8 f2g2 d7c8 g2g1 c8c7 g1g2 f8e8 g2f2 c7b6 f2g2 e8b8 g2g1 b6c7 g1g2 b7b6 g2f2 c7b7

[AndrewGrant]

what is wrong with e5f6? This position is clearly won.

Ethereal: info depth 28 seldepth 54 score cp -1389 time 208997 nodes 11557044478 nps 55297000 tbhits 0 hashfull 999 pv e5f6

[MikeB]

what is wrong with e5f6? This position is clearly won.

Ethereal: info depth 28 seldepth 54 score cp -1389 time 208997 nodes 11557044478 nps 55297000 tbhits 0 hashfull 999 pv e5f6

Hi Andrew, I think you misread the score for the side with the supposed advantage , the game is not clearly won for black - with white's move , the game is now drawn.

Best ,
Michael

[AndrewGrant]

Okay, in that case McBrain is still wrong with a -1200+ eval, even though it happened upon the "correct" move. Am I missing something more here?

[tpoppins]

This position:
[d]3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P4P/PPB1K3/8 w - -

as described here:
http://www.yacpdb.org/#search/M0I0MXIyc ... MS8xLzA=/1

is solved quickly by McBrain (correct plan in 388 seconds):

Six years ago Chiron 1.1 and Deep Shredder 12 solved this instantly and with the 0.00 eval:

My trusty engine tells me Chess Truth

Master Om, who has joined this forum since, should be find this thread amusing.

[Dann Corbit]

Must be a cover charge for that pub:
Forbidden
You don't have permission to access /cgi-bin/chess/YaBB.pl on this server.

[peter]

This position:
[d]3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P4P/PPB1K3/8 w - -

as described here:
http://www.yacpdb.org/#search/M0I0MXIyc ... MS8xLzA=/1

is solved quickly by McBrain (correct plan in 388 seconds):

Six years ago Chiron 1.1 and Deep Shredder 12 solved this instantly and with the 0.00 eval:

My trusty engine tells me Chess Truth

Pity neither Chiron 4 nor Shredder13 do so anymore.
(Broke off with both after 5 minutes at 24 threads, no tbs used, )

[tpoppins]

ChessPub forums have always been free.

Try this link:
http://www.chesspub.com/cgi-bin/chess/Y ... 1319957182
reply #45 (should be on page 5 for guest logins).

[Dann Corbit]

ChessPub forums have always been free.

Try this link:
http://www.chesspub.com/cgi-bin/chess/Y ... 1319957182
reply #45 (should be on page 5 for guest logins).

Forbidden

You don't have permission to access /cgi-bin/chess/YaBB.pl on this server.
Apache/2.4.33 (Unix) Server at www.chesspub.com Port 80

[Ajedrecista]

Hello:

Six years ago Chiron 1.1 and Deep Shredder 12 solved this instantly and with the 0.00 eval:

My trusty engine tells me Chess Truth

Master Om, who has joined this forum since, should be find this thread amusing.

Critter 1.4a also implemented pawn blockage detection back in January of 2012:

Details about Critter 1.4a.

Critter 1.4a - unofficial, unsupported, and only 64bit Sse4 build:

http://www.mediafire.com/download.php?w4x1kctds4oa9og

- tweaked SMP implementation
- sligthly decreased Queen value
- time management: try avoiding blunders in sudden death games when in time trouble
- time management: fixed losing on time whith "ponder on" games on opponent's instant reply
- improved pawn blockage detection (3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P4P/PP1K4/3B4 w - - 0 1)

No guarantees about being equal/stronger than plain 1.4

The FEN is very similar to the OP of this thread and with the same idea of Ba4+, b3+, c4+, d5+, e6+ and f5.

Regards from Spain.

Ajedrecista.