Interesting mate in 15

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Dann Corbit
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Interesting mate in 15

Post by Dann Corbit » Wed Jul 18, 2018 10:22 pm

8/6p1/1pp5/k7/1p6/1P6/6pK/6Qb w - - bm Qa1+; acd 42; acs 557; bm Qa1+; ce 32738; dm 15; id "yacpdb id 329478"; pm Qa1+; pv Qa1+ Kb5 Kg1 g6 Qh8 Ka6 Qa8+ Kb5 Qa1 g5 Qh8 Ka6 Qa8+ Kb5 Qa1 g4 Qh8 Ka6 Qa8+ Kb5 Qa1 g3 Qh8 Ka6 Qa8+ Kb5 Qa1 Kc5 Qe5+;

It is easy to find mate, and even the key move. Finding mate in 15 is harder.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.

AndrewGrant
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Re: Interesting mate in 15

Post by AndrewGrant » Thu Jul 19, 2018 12:17 am

Finding A mate seems pretty easy. Still seeing if I can get to a shorter one.

Code: Select all

info depth 32 seldepth 64 score mate 31 time 3549 nodes 191145097 nps 53843000 tbhits 0 hashfull 0 pv g1a1 a5b5 h2g1 ... 
info depth 33 seldepth 52 score mate 26 time 3612 nodes 193200424 nps 53473000 tbhits 0 hashfull 0 pv g1a1 a5b5 h2g1 ... 
info depth 34 seldepth 52 score mate 25 time 3770 nodes 197727661 nps 52433000 tbhits 0 hashfull 0 pv g1a1 a5b5 h2g1 ... 
info depth 35 seldepth 55 score mate 25 time 3895 nodes 200354198 nps 51425000 tbhits 0 hashfull 0 pv g1a1 a5b5 h2g1 ... 
info depth 36 seldepth 57 score mate 25 time 4040 nodes 204769298 nps 50672000 tbhits 0 hashfull 0 pv g1a1 a5b5 h2g1 ... 
info depth 37 seldepth 56 score mate 25 time 4300 nodes 213671248 nps 49679000 tbhits 0 hashfull 1 pv g1a1 a5b5 h2g1 ... 
info depth 38 seldepth 50 score mate 24 time 4999 nodes 238592641 nps 47718000 tbhits 0 hashfull 2 pv g1a1 a5b5 h2g1 ... 
info depth 39 seldepth 52 score mate 23 time 5079 nodes 242361869 nps 47709000 tbhits 0 hashfull 2 pv g1a1 a5b5 h2g1 ... 

MikeB
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Re: Interesting mate in 15

Post by MikeB » Thu Jul 19, 2018 12:43 am

Dann Corbit wrote:
Wed Jul 18, 2018 10:22 pm
8/6p1/1pp5/k7/1p6/1P6/6pK/6Qb w - - bm Qa1+; acd 42; acs 557; bm Qa1+; ce 32738; dm 15; id "yacpdb id 329478"; pm Qa1+; pv Qa1+ Kb5 Kg1 g6 Qh8 Ka6 Qa8+ Kb5 Qa1 g5 Qh8 Ka6 Qa8+ Kb5 Qa1 g4 Qh8 Ka6 Qa8+ Kb5 Qa1 g3 Qh8 Ka6 Qa8+ Kb5 Qa1 Kc5 Qe5+;

It is easy to find mate, and even the key move. Finding mate in 15 is harder.
not too hard for the latest version of McBrain 9.6 - under 3 seconds


Code: Select all

Mac-Pro:cluster.mfb $ McBrain-96
McBrain 9.6 64 POPCNT by M. Byrne, I. Ivec, Stockfish authors and others
s hash 24000
s threads 23
s syzygypath /applicaConfirmation: hash set to 24000
tions/tablebases
Confirmation: threads set to 23
info string Found 510 tablebases
Confirmation: syzygypath set to /applications/tablebases
s minimal_output true
Confirmation: minimal_output set to true
p f 8/6p1/1pp5/k7/1p6/1P6/6pK/6Qb w - -
g i
info depth 1 seldepth 2 multipv 1 score cp 341 nodes 444 nps 222000 tbhits 0 time 2 pv g1a1 a5b5
info depth 2 seldepth 3 multipv 1 score cp 391 nodes 2093 nps 1046500 tbhits 0 time 2 pv g1c1 g2g1q c1g1
info depth 3 seldepth 4 multipv 1 score cp 375 nodes 4384 nps 2192000 tbhits 0 time 2 pv g1a1 a5b5 a1g7 c6c5
info depth 4 seldepth 6 multipv 1 score cp 318 nodes 8225 nps 2741666 tbhits 0 time 3 pv g1a1 a5b5 a1g7 c6c5 g7d7 b5a6 d7c8 a6b5
info depth 5 seldepth 7 multipv 1 score cp 360 nodes 11758 nps 3919333 tbhits 0 time 3 pv g1a1 a5b5 a1g7 c6c5 g7f6 b5a5
info depth 6 seldepth 8 multipv 1 score cp 351 nodes 22207 nps 7402333 tbhits 0 time 3 pv g1a1 a5b5 a1g7 c6c5 g7d7 b5a6 d7e6 a6a5
info depth 7 seldepth 10 multipv 1 score cp 371 nodes 54135 nps 10827000 tbhits 0 time 5 pv g1a1 a5b5 h2g1 g7g5 a1g7 c6c5 g7g5 b5a6
info depth 8 seldepth 14 multipv 1 score cp 413 nodes 78750 nps 11250000 tbhits 0 time 7 pv g1a1 a5b5 h2g1 g7g6 a1e5 b5a6 e5e4 a6b5 e4g6 b5c5 g6f5 c5d6 f5f4 d6c5
info depth 9 seldepth 14 multipv 1 score cp 444 nodes 112171 nps 12463444 tbhits 9 time 9 pv g1a1 a5b5 h2g1 g7g5 a1e5 b5a6 e5g5 c6c5 g5e7 a6b5 e7e8 b5a6 e8d7
info depth 10 seldepth 16 multipv 1 score cp 515 nodes 137394 nps 13739400 tbhits 28 time 10 pv g1a1 a5b5 h2g1 g7g5 a1e5 b5a6 e5g5 a6b7 g5e7 b7a6 e7b4 b6b5 b4c5 a6b7 c5e7 b7c8
info depth 11 seldepth 20 multipv 1 score cp 652 nodes 192841 nps 12856066 tbhits 134 time 15 pv g1a1 a5b5 h2g1 g7g6 a1g7 b5a5 g7d7 a5b5 d7e6 g6g5 e6c4 b5a5 c4c6 b6b5
info depth 12 seldepth 22 multipv 1 score cp 658 nodes 228321 nps 14270062 tbhits 189 time 16 pv g1a1 a5b5 h2g1 g7g6 a1f6 b5a6 f6c6 g6g5 c6a4 a6b7 a4b4 b7c6 b4e7 g5g4 e7e4 c6c7 e4g4
info depth 13 seldepth 28 multipv 1 score cp 679 nodes 367168 nps 16689454 tbhits 675 time 22 pv g1a1 a5b5 a1e5 b5a6 h2g1 g7g5 e5e8 a6b5 e8e6 b5a5 e6c6 a5a6 c6a4 a6b7 a4b4 b7c7 b4e7 c7c6 e7g5 c6b7 g5e7 b7c6 b3b4 c6b5
info depth 14 seldepth 28 multipv 1 score cp 13261 nodes 525109 nps 17503633 tbhits 1359 time 30 pv g1a1 a5b5 h2g1 g7g5 a1e5 b5a6 e5g5 a6b7 g5e7 b7a6 e7e6 c6c5 e6e4 a6a7 e4c6 c5c4 c6c7 a7a6 c7c4 a6b7 c4e4 b7b8
info depth 15 seldepth 34 multipv 1 score cp 13264 nodes 960418 nps 20008708 tbhits 4797 time 48 pv g1a1 a5b5 h2g1 g7g6 a1f6 b5a6 f6c6 g6g5 c6a4 a6b7 a4d7 b7a6 d7c6 g5g4 c6a4 a6b7 a4d7 b7a6 d7g4 a6b5 g4c4 b5a5
info depth 16 seldepth 29 multipv 1 score cp 13264 nodes 1118026 nps 19964750 tbhits 6379 time 56 pv g1a1 a5b5 h2g1 g7g6 a1f6 c6c5 f6g6 c5c4 g6e8 b5c5 e8c8 c5d5 c8c4 d5d6 c4b4 d6c7 b4c4 c7d6 c4b5 d6c7 b5d5 c7b8 d5c6 b8a7 c6c7 a7a6 c7c4 a6b7 b3b4
info depth 17 seldepth 34 multipv 1 score cp 13267 nodes 1565192 nps 20066564 tbhits 12429 time 78 pv g1a1 a5b5 h2g1 g7g6 a1f6 c6c5 f6g6 c5c4 g6f5 b5c6 f5c8 c6d5 c8c4 d5d6 c4b4 d6c6 b4a4 c6d6 a4a8 d6c7 a8a6 c7c6 a6c8 c6d6 c8b7 d6c5 b7c7 c5d5 c7b6 d5e5
info depth 18 seldepth 33 multipv 1 score cp 13267 nodes 1766795 nps 20077215 tbhits 15074 time 88 pv g1a1 a5b5 h2g1 g7g6 a1f6 c6c5 f6g6 c5c4 g6e8 b5c5 e8e5 c5c6 e5e6 c6c5 e6c4 c5d6 c4b4 d6c7 b4b5 c7b7 b5d7 b7b8 b3b4 b8a8 d7c7 b6b5 c7c6 a8b8 c6b5 b8c7
info depth 19 seldepth 32 multipv 1 score cp 13269 nodes 2040417 nps 20004088 tbhits 17992 time 102 pv g1a1 a5b5 h2g1 g7g6 a1f6 b5a6 f6c6 g6g5 c6d7 g5g4 d7g4 a6b7 g4e4 b7b8 e4c6 b8a7 c6c8 b6b5 c8c7 a7a8 c7a5 a8b8 a5b5 b8c7 b5b4 c7c6
info depth 20 seldepth 32 multipv 1 score cp 13269 nodes 2289468 nps 20083052 tbhits 20719 time 114 pv g1a1 a5b5 h2g1 g7g6 a1f6 b5a6 f6c6 g6g5 c6d7 g5g4 d7g4 a6b7 g4c4 b7b8 c4c6 b8a7 c6c8 b6b5 c8c6 a7b8 c6e8 b8c7 e8b5 c7c8 b5b4 c8c7
info depth 21 seldepth 40 multipv 1 score cp 13270 nodes 2700527 nps 20304714 tbhits 26189 time 133 pv g1a1 a5b5 h2g1 g7g6 a1f6 b5a6 f6c6 g6g5 c6d7 g5g4 d7g4 a6b7 g4d7 b7b8 g1f2 b8a8 d7c6 a8a7 f2g1 a7b8 c6b6 b8c8 b6b4 c8c7 b4e7 c7b8 b3b4 b8c8
info depth 22 seldepth 40 multipv 1 score cp 13270 nodes 3171684 nps 20331307 tbhits 33675 time 156 pv g1a1 a5b5 h2g1 g7g6 a1f6 b5a6 f6c6 g6g5 c6d7 g5g4 d7g4 a6b7 g4d7 b7b8 g1f2 b8a8 d7c6 a8a7 f2g1 a7b8 c6b6 b8c8 b6b4 c8c7
info depth 23 seldepth 39 multipv 1 score cp 13270 nodes 4137571 nps 20282210 tbhits 54381 time 204 pv g1a1 a5b5 h2g1 g7g5 a1e5 b5a6 e5g5 a6b7 g5e7 b7b8 e7d8 b8b7 d8d7 b7b8 d7c6 b8a7 c6c8 b6b5 c8c6 a7b8 c6b5 b8a8 b5b4 a8a7 b4a3 a7b6 b3b4 b6b5 a3d3 b5b6 b4b5 b6c5
info depth 24 seldepth 39 multipv 1 score cp 13270 nodes 4734734 nps 20496683 tbhits 65634 time 231 pv g1a1 a5b5 h2g1 g7g5 a1e5 b5a6 e5g5 a6b7 g5e7 b7b8 e7d8 b8b7 d8d7 b7b8 d7c6 b8a7 c6c8 b6b5 c8c6 a7b8 c6b5 b8a8 b5b4 a8a7 b4a3 a7b6 b3b4 b6b5 a3f3 b5b6 b4b5 b6c7 b5b6 c7d8 b6b7 d8c7 b7b8q c7b8
info depth 25 seldepth 40 multipv 1 score cp 13270 nodes 5219881 nps 20390160 tbhits 73259 time 256 pv g1a1 a5b5 h2g1 g7g5 a1e5 b5a6 e5g5 a6b7 g5e7 b7b8 e7d8 b8b7 d8d7 b7b8 d7c6 b8a7 c6c8 b6b5 c8c6 a7b8 c6b5 b8a8 b5b4 a8a7 b4a3 a7b6 b3b4 b6b5 a3d3 b5b6 d3d8 b6b5 d8g5 b5a6 b4b5 a6b6
info depth 26 seldepth 40 multipv 1 score cp 13270 nodes 6195065 nps 20513460 tbhits 92387 time 302 pv g1a1 a5b5 h2g1 g7g5 a1e5 b5a6 e5g5 a6b7 g5e7 b7b8 e7d8 b8b7 d8d7 b7b8 d7c6 b8a7 c6c8 b6b5 c8c6 a7b8 c6b5 b8a8 b5b4 a8a7 b4a3 a7b6 b3b4 b6b5 a3d3 b5b6 d3d8 b6b5 d8g5 b5a6 b4b5 a6b6 g5f6 b6b7 b5b6 b7a6
info depth 27 seldepth 45 multipv 1 score cp 13270 nodes 9333735 nps 21069379 tbhits 172620 time 443 pv g1a1 a5b5 h2g1 g7g5 a1e5 b5a6 e5g5 a6b7 g5e7 b7b8 e7d8 b8b7 d8d7 b7b8 d7c6 b8a7 c6c8 b6b5 c8c6 a7b8 c6b5 b8a8 b5b4 a8a7 b4a3 a7b6 b3b4 b6b5 a3d3 b5b6 b4b5 b6c5 b5b6 c5c6 b6b7 c6c7 b7b8q c7b8
info depth 28 seldepth 44 multipv 1 score cp 13272 nodes 12120957 nps 21567539 tbhits 289932 time 562 pv g1a1 a5b5 h2g1 g7g6 a1f6 c6c5 f6g6 b5a6 g6c6 a6a7 c6c7 a7a6 c7e7 c5c4 e7b4 b6b5 b3c4 b5c4
info depth 29 seldepth 46 multipv 1 score mate 20 nodes 24239459 nps 23579240 hashfull 5 tbhits 670728 time 1028 pv g1a1 a5b5 h2g1 g7g6 a1f6 c6c5 f6g6 c5c4 g6f5 b5c6 b3c4 b4b3 f5b5 c6c7 b5b3 c7c6 b3b5 c6c7 b5b4 c7c6 b4e7 b6b5 e7e8 c6d6 c4b5 d6c5 e8c6 c5d4 b5b6 d4e3 b6b7 e3d3 c6f3 d3c2 b7b8q c2c1 f3e3 c1c2 b8b3
info depth 30 seldepth 46 multipv 1 score mate 20 nodes 26983372 nps 23963918 hashfull 5 tbhits 796120 time 1126 pv g1a1 a5b5 h2g1 g7g6 a1f6 b5a6 f6c6 a6a7 c6g6 a7b7 g6d6 b7a8 d6c6 a8a7 c6c8 b6b5 c8c6 a7b8 c6b5 b8c7 b5b4 c7c6 b4d4 c6c7 d4c5 c7d7 b3b4 d7d8 b4b5 d8e8 b5b6 e8d7 b6b7 d7e6 b7b8q e6f6 b8f8 f6g6 c5f5
info depth 31 seldepth 48 multipv 1 score mate 19 nodes 29903000 nps 24271915 hashfull 6 tbhits 889758 time 1232 pv g1a1 a5b5 h2g1 g7g6 a1f6 b5a6 f6c6 a6a7 c6g6 a7b7 g6d6 b7a8 d6b4 a8b7 b4c3 b6b5 b3b4 b7b6 c3c5 b6b7 c5b5 b7c7 b5g5 c7d6 g5c5 d6d7 b4b5 d7e6 b5b6 e6f6 b6b7 f6g6 b7b8q g6f6 b8f8 f6g6 c5f5
info depth 32 seldepth 38 multipv 1 score mate 19 nodes 34708137 nps 24703300 hashfull 7 tbhits 1045280 time 1405 pv g1a1 a5b5 h2g1 g7g5 a1f6 c6c5 f6f3 c5c4 f3d5 b5a6 b3c4 a6a7 d5g5 a7b8 g5b5 b8c7 b5b4 c7c6 b4b5 c6c7 b5d5 c7c8 d5d6 c8b7 d6d7 b7b8 d7c6 b8a7 c6c8 b6b5 c4c5 b5b4 c8c7 a7a8 c5c6 b4b3 c7b7
info depth 33 seldepth 38 multipv 1 score mate 19 nodes 34842846 nps 24728776 hashfull 7 tbhits 1048003 time 1409 pv g1a1 a5b5 h2g1 g7g5 a1f6 c6c5 f6f3 c5c4 f3d5 b5a6 b3c4 a6a7 d5g5 a7b8 g5b5 b8c7 b5b4 c7c6 b4b5 c6c7 b5d5 c7c8 d5d6 c8b7 d6d7 b7b8 d7c6 b8a7 c6c8 b6b5 c4c5 b5b4 c8c7 a7a8 c5c6 b4b3 c7b7
info depth 34 seldepth 38 multipv 1 score mate 19 nodes 35009162 nps 24758954 hashfull 7 tbhits 1051100 time 1414 pv g1a1 a5b5 h2g1 g7g5 a1f6 c6c5 f6f3 c5c4 f3d5 b5a6 b3c4 a6a7 d5g5 a7b8 g5b5 b8c7 b5b4 c7c6 b4b5 c6c7 b5d5 c7c8 d5d6 c8b7 d6d7 b7b8 d7c6 b8a7 c6c8 b6b5 c4c5 b5b4 c8c7 a7a8 c5c6 b4b3 c7b7
info depth 35 seldepth 38 multipv 1 score mate 19 nodes 39660025 nps 25037894 hashfull 8 tbhits 1190653 time 1584 pv g1a1 a5b5 h2g1 g7g5 a1f6 c6c5 f6f3 c5c4 f3d5 b5a6 b3c4 a6a7 d5g5 a7b8 g5b5 b8c7 b5b4 c7c6 b4b5 c6c7 b5d5 c7c8 d5d6 c8b7 d6d7 b7b8 d7c6 b8a7 c6c8 b6b5 c4c5 b5b4 c8c7 a7a8 c5c6 b4b3 c7b7
info depth 36 seldepth 38 multipv 1 score mate 19 nodes 45927445 nps 25572074 hashfull 9 tbhits 1400917 time 1796 pv g1a1 a5b5 h2g1 g7g5 a1f6 c6c5 f6f3 c5c4 f3d5 b5a6 b3c4 a6a7 d5g5 a7b8 g5b5 b8c7 b5b4 c7c6 b4b5 c6c7 b5d5 c7c8 d5d6 c8b7 d6d7 b7b8 d7c6 b8a7 c6c8 b6b5 c4c5 b5b4 c8c7 a7a8 c5c6 b4b3 c7b7
info depth 37 seldepth 52 multipv 1 score mate 15 nodes 62594684 nps 26957228 hashfull 9 tbhits 1926923 time 2322 pv g1a1 a5b5 h2g1 g7g6 a1h8 b5a6 h8a8 a6b5 a8a1 g6g5 a1h8 b5a6 h8a8 a6b5 a8a1 g5g4 a1h8 b5a5 h8a8 a5b5 a8a1 g4g3 a1h8 b5a6 h8a8 a6b5 a8a1 c6c5 a1a4
info depth 38 seldepth 30 multipv 1 score mate 15 nodes 75900669 nps 27782089 hashfull 9 tbhits 2281209 time 2732 pv g1a1 a5b5 h2g1 g7g6 a1h8 b5a6 h8a8 a6b5 a8a1 g6g5 a1h8 b5a6 h8a8 a6b5 a8a1 g5g4 a1h8 b5a5 h8a8 a5b5 a8a1 g4g3 a1h8 b5a6 h8a8 a6b5 a8a1 c6c5 a1a4

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Eelco de Groot
Posts: 4172
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Location: Groningen

Re: Interesting mate in 15

Post by Eelco de Groot » Thu Jul 19, 2018 2:10 am

Dann Corbit wrote:
Wed Jul 18, 2018 10:22 pm
8/6p1/1pp5/k7/1p6/1P6/6pK/6Qb w - - bm Qa1+; acd 42; acs 557; bm Qa1+; ce 32738; dm 15; id "yacpdb id 329478"; pm Qa1+; pv Qa1+ Kb5 Kg1 g6 Qh8 Ka6 Qa8+ Kb5 Qa1 g5 Qh8 Ka6 Qa8+ Kb5 Qa1 g4 Qh8 Ka6 Qa8+ Kb5 Qa1 g3 Qh8 Ka6 Qa8+ Kb5 Qa1 Kc5 Qe5+;

It is easy to find mate, and even the key move. Finding mate in 15 is harder.
Hi dann,
with one thread Kaissa needs depth 73


8/6p1/1pp5/k7/1p6/1P6/6pK/6Qb w - -

Engine: Kaissa IV (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

39/42 0:01 +17.57 1.Qa1+ Kb5 2.Kg1 g6 3.Qe5+ Ka6 4.Qc7 Kb5
5.Qd6 c5 6.Qxg6 c4 7.Qe8+ Ka6 8.Qc8+ Ka7
9.Qc7+ Ka6 10.Qxc4+ Kb7 11.Qd5+ Kc7
12.Qb5 Kb7 13.Qc4 Kb8 14.Qc6 (7.089.862) 3643

40/48 0:02 +17.57 1.Qa1+ Kb5 2.Kg1 g6 3.Qe5+ Ka6 4.Qc7 Kb5
5.Qd6 c5 6.Qxg6 c4 7.Qe8+ Ka6 8.Qc8+ Ka7
9.Qc7+ Ka6 10.Qxc4+ Kb7 11.Qc2 b5
12.Qc5 Kb8 13.Qxb5+ Ka7 14.Qc5+ (7.378.298) 3645
.
.
.
45/46 0:07 +18.61++ 1.Qa1+ (30.434.966) 4015

45/46 0:07 +18.90++ 1.Qa1+ (31.845.610) 4030

45/46 0:08 +19.26++ 1.Qa1+ (33.879.862) 4025

45/46 0:08 +42.67++ 1.Qa1+ (35.392.677) 4031

45/46 0:09 +47.13++ 1.Qa1+ (37.384.477) 4048

45/46 0:09 +52.20++ 1.Qa1+ (38.412.133) 4051

45/46 0:10 +132.26++1.Qa1+ (41.520.503) 4106

45/48 0:11 +M24++ 1.Qa1+ (46.452.697) 4120

45/48 0:12 +M23 1.Qa1+ Kb5 2.Kg1 g6 3.Qe5+ Ka6 4.Qc7 Kb5
5.Qd6 Ka6 6.Qxc6 Ka7 7.Qc7+ Ka6
8.Qd7 g5 9.Qc6 Ka7 10.Qc7+ Ka6
11.Qd7 b5 12.Qc7 g4 13.Qc6+ Ka7
14.Qxb5 (50.531.144) 4120
.
.
.

67/38 0:51 +M19 1.Qa1+ Kb5 2.Kg1 g5 3.Qe5+ Ka6 4.Qe8 Kb7
5.Qd7+ Kb8 6.Qxc6 Ka7 7.Qc7+ Ka6
8.Qc8+ Ka7 9.Qc6 Kb8 10.Qxb6+ Kc8
11.Qxb4 Kd7 12.Qc5 Ke6 13.b4 Kf6
14.b5 (212.696.223) 4142

68/38 0:57 +M19 1.Qa1+ Kb5 2.Kg1 g5 3.Qe5+ Ka6 4.Qe8 Kb7
5.Qd7+ Kb8 6.Qxc6 Ka7 7.Qc7+ Ka6
8.Qc8+ Ka7 9.Qc6 Kb8 10.Qxb6+ Kc8
11.Qxb4 Kd7 12.Qc5 Ke6 13.b4 Kf6
14.b5 (240.301.485) 4165

69/54 1:48 +M19 1.Qa1+ Kb5 2.Kg1 g5 3.Qe5+ Ka6 4.Qe8 Kb7
5.Qd7+ Kb8 6.Qxc6 Ka7 7.Qc7+ Ka6
8.Qc8+ Ka7 9.Qc6 Kb8 10.Qxb6+ Kc8
11.Qxb4 Kc7 12.Qc5+ Kd7 13.b4 Ke6
14.b5 (469.652.761) 4347

70/38 2:03 +M18 1.Qa1+ Kb5 2.Kg1 g5 3.Qf6 c5 4.Qd6 c4
5.Qd5+ Ka6 6.bxc4 Ka7 7.Qd7+ Kb8
8.Qc6 b3 9.Qxb6+ Kc8 10.c5 b2 11.c6 b1Q+
12.Qxb1 Kc7 13.Qb7+ Kd6 14.c7 (536.323.796) 4351

71/36 2:12 +M18 1.Qa1+ Kb5 2.Kg1 g5 3.Qf6 c5 4.Qd6 c4
5.Qd5+ Ka6 6.bxc4 Ka7 7.Qd7+ Kb8
8.Qc6 b3 9.Qxb6+ Kc8 10.c5 b2 11.c6 b1Q+
12.Qxb1 Kc7 13.Qb7+ Kd6 14.c7 (580.252.001) 4365

72/36 2:26 +M18 1.Qa1+ Kb5 2.Kg1 g5 3.Qf6 c5 4.Qd6 c4
5.Qd5+ Ka6 6.bxc4 Ka7 7.Qd7+ Kb8
8.Qc6 b3 9.Qxb6+ Kc8 10.c5 b2 11.c6 b1Q+
12.Qxb1 Kc7 13.Qb7+ Kd6 14.c7 (648.629.209) 4431

73/50 2:57 +M15 1.Qa1+ Kb5 2.Kg1 g6 3.Qh8 Ka6 4.Qa8+ Kb5
5.Qa1 g5 6.Qh8 Ka6 7.Qa8+ Kb5 8.Qa1 g4
9.Qh8 Ka6 10.Qa8+ Kb5 11.Qa1 g3
12.Qh8 Ka6 13.Qa8+ Kb5 14.Qa1 (792.717.479) 4467

74/30 3:02 +M15 1.Qa1+ Kb5 2.Kg1 g6 3.Qh8 Ka6 4.Qa8+ Kb5
5.Qa1 g5 6.Qh8 Ka6 7.Qa8+ Kb5 8.Qa1 g4
9.Qh8 Ka6 10.Qa8+ Kb5 11.Qa1 g3
12.Qh8 Ka6 13.Qa8+ Kb5 14.Qa1 (814.530.111) 4453
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan

kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 3:19 pm

Re: Interesting mate in 15

Post by kgburcham » Thu Jul 19, 2018 3:22 am




Nalimov 6 men EGTB available - 999 MB cache
Engine: Houdini 6.01 Pro x64-pext (8192 MB)
by Robert Houdart
8 threads used
16/43 0:00 +5.58 1.Qa1+ Kb5 2.Kg1 g6 3.Qg7 Ka6 4.Qxg6 Kb7 5.Qg7+ Kc8 6.Qe7 c5 7.Qd6 Kb7 8.Qd7+ Kb8
9.Qc6 b5 10.Qxc5 Kb7 11.Qxb4 Kc6 12.Qe4+ Kc5 13.b4+ (1.947.707) 17085 TB:1.919
17/43 0:00 +5.79 1.Qa1+ Kb5 2.Kg1 g6 3.Qg7 Ka6 4.Qxg6 Kb7 5.Qd6 b5 6.Qd7+ Kb6 7.Qe7 c5 8.Qd6+ Ka7
9.Qc7+ Ka8 10.Qc8+ Ka7 11.Qxc5+ Ka8 12.Qc6+ Kb8 13.Qd7 (2.542.246) 17532 TB:2.752
18/43 0:00 +6.47 1.Qa1+ Kb5 2.Qe5+ Ka6 3.Kg1 g6 4.Qg7 c5 5.Qxg6 Kb7 6.Qd6 Kc8 7.Qe7 b5 8.Qxc5+ Kd7
9.Qxb4 Ke6 10.Qxb5 Kf6 11.b4 Ke6 12.Qc5 (3.398.809) 14401 TB:5.664
19/43 0:00 +7.45 1.Qa1+ Kb5 2.Qe5+ Ka6 3.Kg1 g6 4.Qg7 c5 5.Qxg6 Kb7 6.Qd6 Kc8 7.Qe7 b5 8.Qxc5+ Kd7
9.Qxb4 Kc6 10.Qe4+ Kc5 11.b4+ Kd6 12.Qf5 Ke7 13.Qxb5 Ke6 (4.440.686) 13964 TB:9.065
20/85 0:00 +M41 1.Qa1+ Kb5 2.Kg1 g5 3.Qe5+ Ka6 4.Qxg5 Kb7 5.Qg7+ Kc8 6.Qe7 b5 7.Qd6 Kb7 8.Qd7+ Kb6
9.Qe7 c5 10.Qd6+ Ka7 11.Qc7+ Ka6 12.Qc6+ Ka7 13.Qxb5 c4 14.bxc4 (8.270.147) 12073 TB:29.364
21/85 0:00 +M37 1.Qa1+ Kb5 2.Kg1 g5 3.Qe5+ Ka6 4.Qxg5 Kb7 5.Qg7+ Kc8 6.Qe7 b5 7.Qd6 Kb7 8.Qd7+ Kb6
9.Qe7 c5 10.Qd6+ Ka7 11.Qc7+ Ka6 12.Qc6+ Ka7 13.Qxb5 c4 14.bxc4 (8.734.901) 11677 TB:33.062
22/85 0:01 +M38 1.Qa1+ Kb5 2.Kg1 g5 3.Qh8 Ka6 4.Qa8+ Kb5 5.Qa1 g4 6.Qg7 Ka6 7.Qxg4 Kb7 8.Qd7+ Kb8
9.Qxc6 Ka7 10.Qe4 b5 11.Qc6 Kb8 12.Qb6+ Kc8 13.Qd6 (29.943.358) 16211 TB:103.485
23/85 0:08 +M66 1.Qa1+ Kb5 2.Kg1 g5 3.Qf6 Ka6 4.Qxg5 Kb7 5.Qe7+ Kc8 6.Qd6 c5 7.Qe7 Kb8 8.Qd7 b5 9.Qc6
c4 10.Qxb5+ Kc8 11.Qc6+ Kd8 12.bxc4 b3 13.Qd5+ Kc7 14.Qc5+ (300.069.201) 36218 TB:484.296
24/85 0:11 +M15 1.Qa1+ Kb5 2.Kg1 g6 3.Qh8 Ka6 4.Qa8+ Kb5 5.Qa1 g5 6.Qh8 Ka6 7.Qa8+ Kb5 8.Qa1 g4 9.Qh8
Ka6 10.Qa8+ Kb5 11.Qa1 g3 12.Qh8 Ka6 13.Qa8+ (444.052.940) 40284 TB:609.644
25/85 0:11 +M15 1.Qa1+ Kb5 2.Kg1 g6 3.Qh8 Ka6 4.Qa8+ Kb5 5.Qa1 g5 6.Qh8 Ka6 7.Qa8+ Kb5 8.Qa1 g4 9.Qh8
Ka6 10.Qa8+ Kb5 11.Qa1 g3 12.Qh8 Ka6 13.Qa8+ (490.872.814) 41402 TB:662.654
26/85 0:12 +M15 1.Qa1+ Kb5 2.Kg1 g6 3.Qh8 Ka6 4.Qa8+ Kb5 5.Qa1 g5 6.Qh8 Ka6 7.Qa8+ Kb5 8.Qa1 g4 9.Qh8
Ka6 10.Qa8+ Kb5 11.Qa1 g3 12.Qh8 Ka6 13.Qa8+ Kb5 (527.253.358) 42166 TB:695.330
no chess program was born totally from one mind. all chess programs have many ideas from many minds.

Jouni
Posts: 2029
Joined: Wed Mar 08, 2006 7:15 pm

Re: Interesting mate in 15

Post by Jouni » Thu Jul 19, 2018 5:35 am

SF matefinder is specially good in long mate. This is found under 1 second:

Analysis by Stockfish MateFinder 9 64 BMI2:

1.Qa1+ Kb5 2.Kg1 g6 3.Qh8 Ka6 4.Qa8+ Kb5 5.Qa1 g5 6.Qh8 Ka6 7.Qa8+ Kb5 8.Qa1 g4 9.Qh8 Ka6 10.Qa8+ Kb5 11.Qa1 g3 12.Qh8 Ka6 13.Qa8+ Kb5 14.Qa1 Kc5 15.Qe5#
+- (#15) Depth: 28/52 00:00:01 6393kN, tb=74278
Jouni

User avatar
Eelco de Groot
Posts: 4172
Joined: Sun Mar 12, 2006 1:40 am
Location: Groningen

Re: Interesting mate in 15

Post by Eelco de Groot » Thu Jul 19, 2018 8:40 am

If you want to torture your computer and BrainiMac and Matefinders; very silly related positions but Black wins them.

-M17

This seems to go very sloooly... Maybe with EGTBs, no fortress
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan

Joerg Oster
Posts: 691
Joined: Fri Mar 10, 2006 3:29 pm
Location: Germany

Re: Interesting mate in 15

Post by Joerg Oster » Thu Jul 19, 2018 8:53 am

Dann Corbit wrote:
Wed Jul 18, 2018 10:22 pm
8/6p1/1pp5/k7/1p6/1P6/6pK/6Qb w - - bm Qa1+; acd 42; acs 557; bm Qa1+; ce 32738; dm 15; id "yacpdb id 329478"; pm Qa1+; pv Qa1+ Kb5 Kg1 g6 Qh8 Ka6 Qa8+ Kb5 Qa1 g5 Qh8 Ka6 Qa8+ Kb5 Qa1 g4 Qh8 Ka6 Qa8+ Kb5 Qa1 g3 Qh8 Ka6 Qa8+ Kb5 Qa1 Kc5 Qe5+;

It is easy to find mate, and even the key move. Finding mate in 15 is harder.
Not too difficult for Zander (my SF Mod),
1 Thread, 512 MB Hash:

info depth 41 seldepth 33 multipv 1 score mate 15 nodes 32558996 nps 3241959 hashfull 218 tbhits 0 time 10043 pv g1a1 a5b5 h2g1 g7g6 a1h8 b5a6 h8a8 a6b5 a8a1 g6g5 a1h8 b5a6 h8a8 a6b5 a8a1 g5g4 a1h8 b5a6 h8a8 a6b5 a8a1 g4g3 a1h8 b5a6 h8a8 a6b5 a8a1 b5c5 a1e5
bestmove g1a1 ponder a5b5
Jörg Oster

Jouni
Posts: 2029
Joined: Wed Mar 08, 2006 7:15 pm

Re: Interesting mate in 15

Post by Jouni » Thu Jul 19, 2018 4:06 pm

17 mover is easy for SF9 no torture :)

Analysis by Stockfish 9 64 BMI2:

1.Kg3 c5 2.Kf2 c4 3.Bh2 cxb3 4.Be5 g6 5.Kg1 Kb5 6.Bb2 Kc4 7.Kh2 Kd3 8.Bc1 Kc2 9.Be3 b2 10.Kg3 b1Q 11.Kf4 Kd3 12.Ke5 Kxe3 13.Ke6 g1Q 14.Ke7 Qf5 15.Kd8 Qf6+ 16.Kc7 Qc6+ 17.Kb8 Qb7#
-+ (-#17) Depth: 44/37 00:00:15 209mN, tb=1751787
Jouni

MikeB
Posts: 3559
Joined: Thu Mar 09, 2006 5:34 am
Location: Pen Argyl, Pennsylvania

Re: Interesting mate in 15

Post by MikeB » Fri Jul 20, 2018 3:22 am

Joerg Oster wrote:
Thu Jul 19, 2018 8:53 am
Dann Corbit wrote:
Wed Jul 18, 2018 10:22 pm
8/6p1/1pp5/k7/1p6/1P6/6pK/6Qb w - - bm Qa1+; acd 42; acs 557; bm Qa1+; ce 32738; dm 15; id "yacpdb id 329478"; pm Qa1+; pv Qa1+ Kb5 Kg1 g6 Qh8 Ka6 Qa8+ Kb5 Qa1 g5 Qh8 Ka6 Qa8+ Kb5 Qa1 g4 Qh8 Ka6 Qa8+ Kb5 Qa1 g3 Qh8 Ka6 Qa8+ Kb5 Qa1 Kc5 Qe5+;

It is easy to find mate, and even the key move. Finding mate in 15 is harder.
Not too difficult for Zander (my SF Mod),
1 Thread, 512 MB Hash:

info depth 41 seldepth 33 multipv 1 score mate 15 nodes 32558996 nps 3241959 hashfull 218 tbhits 0 time 10043 pv g1a1 a5b5 h2g1 g7g6 a1h8 b5a6 h8a8 a6b5 a8a1 g6g5 a1h8 b5a6 h8a8 a6b5 a8a1 g5g4 a1h8 b5a6 h8a8 a6b5 a8a1 g4g3 a1h8 b5a6 h8a8 a6b5 a8a1 b5c5 a1e5
bestmove g1a1 ponder a5b5
Zander is very interesting - one of those derivatives that is very much a derivative. I hope you continue to update. Thanks! 👊

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