SF misevaluating pawn endings

[Spliffjiffer]

2 simple pawn endings SF has problems with...

Engine: asmfish 04.11.2016; CPU: amd a10 7870k (quad core); TB's: None

[D]8/1p4p1/5k2/5p2/8/3K3P/5PP1/8 w - - 0 1
1.f4...only drawing move...after a 15 min search asmfish fails to find this, scoring 1.Kd4 as best with -4.49 at depth 48.
After forcing 1.f4 asmfish fails high with 1...b5, giving a score of over +18 for black at low depths...then quickly resolves to 0.00.



[D]8/6pk/7p/8/8/2npPP1P/1RnK2P1/8 b - - 0 1
1...Nxe3...only drawing move...after a 15 min search asmfish fails to find this, scoring 1...Nd5 as best with -2.47 at depth 43.

After 1....Nxe3 2.Kxc3 Nd1 3.Kb3 [Here asmfish stubbornly tries to avoid the pawn endgame with 3...Ne3?] Nxb2 4.Kxb2 Kg6 5.Kc3 Kf5 6.g3 h5! (only move, which seems to be the one making asmfish misevaluating the whole line) its a draw...with 6.g3 SF fails high, scoring the position +41.34 for white at lower depths until evaluating the position with +0.08 after around 20 sec.

regards

[Jouni]

No big problem

First:

Analysis by Stockfish 8 64 BMI2:

1. = (0.00): 1.f4 Ke6 2.Kd4 b5 3.g4 fxg4 4.hxg4 b4 5.Kc4 b3 6.Kxb3
2. -+ (-13.19): 1.h4 Ke5 2.Kc4 f4 3.Kc5 Ke4 4.h5 Kd3 5.Kd6 b5 6.Ke7 b4 7.Ke6 b3 8.Kf5 b2 9.Kg4 b1Q 10.h6 gxh6 11.f3 Qc1 12.g3 fxg3
3. -+ (-21.80): 1.Kd4 f4 2.Kc5 Kf5 3.Kb5 Ke4 4.Kc4 b5+ 5.Kc3 f3 6.g3 b4+ 7.Kc2 b3+ 8.Kb1 Kd3 9.g4 Ke2 10.g5 Kxf2 11.h4 Kg3 12.h5 f2 13.Kb2 f1Q 14.Ka3 Qc1+ 15.Kb4 b2
4. -+ (-60.95): 1.Kc4 f4 2.Kb5 Kf5 3.Kc5 Ke4 4.Kc4 b5+ 5.Kc3 f3 6.g3 b4+ 7.Kc2 b3+ 8.Kb1 Kd3 9.g4 Ke2 10.h4 Kxf2 11.Ka1 b2+ 12.Ka2 b1Q+ 13.Ka3 Kg3


second:

Analysis by Stockfish 8 64 BMI2:

1. +/= (0.51): 1...Nxe3 2.Kxd3 Kg6 3.Rb3 Ned5 4.Rxc3 Nxc3 5.Kxc3 h5 6.h4 Kf5 7.g3 Ke5 8.Kd2 Kd6 9.Ke3 Ke5 10.Kf2 Kf6 11.Kg1 Ke5 12.Kf1 Kf6 13.Ke1 Ke5 14.Ke2 Ke6 15.Kd3 Kd5 16.f4 Ke6 17.Kd4 Kf5 18.Ke3 Kg4 19.Kf2 Kf5 20.Kf3 g6 21.Ke3
2. +/- (1.30): 1...Nd5 2.e4 Ndb4 3.f4 h5 4.h4 Kg6 5.Rb1 Kf6 6.Kc3 Kf7 7.Rf1 Kf6 8.Rg1 g6 9.g3 Ke7 10.Rb1 Ke6 11.Rf1 Kf6 12.Rh1 Ke6 13.Rh2 Kf6 14.Rf2 Kg7 15.f5 Nc6 16.Kxd3 N2b4+ 17.Ke3 Ne5 18.Kd4 Nec6+ 19.Kc3 Ne5
3. +- (2.57): 1...Na4 2.Rb5 Kg8 3.Rb8+ Kf7 4.Kxd3 Ne1+ 5.Ke2 Nxg2 6.Kf2 Nxe3 7.Kxe3 Nc3 8.Kf4 Ne2+ 9.Kf5 Ng3+ 10.Kg4 Ne2 11.Rb7+ Kg6 12.Rb6+ Kf7 13.Kf5 Nd4+ 14.Ke4 Ne2 15.f4 Ng3+ 16.Ke5 Nh5 17.Rb7+ Kg8 18.Ra7 Nf6 19.Kf5 Nh5 20.Rb7 Kh7 21.Rc7 Nf6 22.Ke6 Ne4 23.Ke5 Nf6 24.Kf5 Nh5 25.Rc6 Ng3+ 26.Ke5 Nh5 27.Rd6
4. +- (5.41): 1...Nd1 2.Kxd1 Nxe3+ 3.Ke1 h5 4.Rd2 Nd5 5.Rxd3 Nf4 6.Rd4 Ne6 7.Ra4 Nc7 8.Kf2 Kh6 9.Ra5 h4 10.Ke3 Kg6 11.Ke4 Kf6 12.Ra4 Ne8 13.Ra6+ Ke7 14.Ke5 Kf7 15.Ra4 Nf6 16.Rxh4 Nd7+ 17.Kd6 Nf8 18.Rg4 Ng6 19.Ra4 Kf6 20.Kd5 Ne7+ 21.Ke4

some seconds analysis

[MikeB]

2 simple pawn endings SF has problems with...

Engine: asmfish 04.11.2016; CPU: amd a10 7870k (quad core); TB's: None

[D]8/1p4p1/5k2/5p2/8/3K3P/5PP1/8 w - - 0 1
1.f4...only drawing move...after a 15 min search asmfish fails to find this, scoring 1.Kd4 as best with -4.49 at depth 48.
After forcing 1.f4 asmfish fails high with 1...b5, giving a score of over +18 for black at low depths...then quickly resolves to 0.00.



[D]8/6pk/7p/8/8/2npPP1P/1RnK2P1/8 b - - 0 1
1...Nxe3...only drawing move...after a 15 min search asmfish fails to find this, scoring 1...Nd5 as best with -2.47 at depth 43.

After 1....Nxe3 2.Kxc3 Nd1 3.Kb3 [Here asmfish stubbornly tries to avoid the pawn endgame with 3...Ne3?] Nxb2 4.Kxb2 Kg6 5.Kc3 Kf5 6.g3 h5! (only move, which seems to be the one making asmfish misevaluating the whole line) its a draw...with 6.g3 SF fails high, scoring the position +41.34 for white at lower depths until evaluating the position with +0.08 after around 20 sec.

regards

no problems here:
1st position

Code: Select all

<< info string Found 510 tablebases
>> position fen 8/1p4p1/5k2/5p2/8/3K3P/5PP1/8 w - - 0 1
>> go infinite
<< info depth 1 seldepth 1 multipv 1 score cp -4 nodes 1120 nps 1120000 tbhits 0 time 1 pv d3c3
<< info depth 2 seldepth 2 multipv 1 score cp 3 nodes 3126 nps 3126000 tbhits 0 time 1 pv d3c3 b7b6
<< info depth 3 seldepth 3 multipv 1 score cp 0 nodes 4907 nps 2453500 tbhits 0 time 2 pv d3c4 g7g5 g2g3
<< info depth 4 seldepth 4 multipv 1 score cp -6 nodes 5998 nps 2999000 tbhits 0 time 2 pv d3c4 g7g5 g2g3 b7b6
<< info depth 5 seldepth 5 multipv 1 score cp -4 nodes 7393 nps 3696500 tbhits 0 time 2 pv d3c4 g7g6 f2f3 f6e5 c4c5
<< info depth 6 seldepth 6 multipv 1 score cp 6 nodes 14332 nps 4777333 tbhits 49 time 3 pv d3c4 g7g5 g2g3 f6e5 h3h4 g5h4 g3h4
<< info depth 7 seldepth 8 multipv 1 score cp 4 nodes 35023 nps 8755750 tbhits 218 time 4 pv d3d4 g7g6 d4c4 f5f4 c4c5 f6e5 c5b6
<< info depth 8 seldepth 9 multipv 1 score cp 6 nodes 38496 nps 9624000 tbhits 242 time 4 pv d3d4 g7g5 d4c5 f6e5 c5b6 e5e4 f2f3 e4e5 b6b7
<< info depth 9 seldepth 9 multipv 1 score cp 7 nodes 50684 nps 10136800 tbhits 366 time 5 pv d3c4 g7g5 c4c5 f5f4 c5b6 f6e5 f2f3 e5d5 b6b7
<< info depth 10 seldepth 11 multipv 1 score cp 17 nodes 102090 nps 17015000 tbhits 826 time 6 pv d3c4 f6e5 c4b5 f5f4 b5b6 f4f3 g2g3 e5d5 b6b7 d5d4
<< info depth 11 seldepth 13 multipv 1 score cp 0 nodes 177976 nps 22247000 tbhits 1897 time 8 pv d3c4 f6e5 c4b5 g7g5 b5c5 e5e4 c5b6 f5f4 b6b7 e4d3 b7c7
<< info depth 12 seldepth 15 multipv 1 score cp 0 nodes 237673 nps 23767300 tbhits 2893 time 10 pv d3d4 g7g5 d4d5 f5f4 d5c5 f6f5 c5d4 f5e6 d4c4 e6e5 c4c5 e5f5
<< info depth 13 seldepth 16 multipv 1 score cp 0 nodes 356036 nps 25431142 tbhits 5099 time 14 pv f2f4 g7g5 f4g5 f6g5
<< info depth 14 seldepth 16 multipv 1 score cp 0 nodes 406894 nps 27126266 tbhits 6896 time 15 pv f2f4 g7g5 f4g5 f6g5
<< info depth 15 seldepth 16 multipv 1 score cp 0 nodes 432216 nps 27013500 tbhits 7621 time 16 pv f2f4 g7g5 f4g5 f6g5
<< info depth 16 seldepth 16 multipv 1 score cp 0 nodes 452047 nps 26591000 tbhits 8273 time 17 pv f2f4 g7g5 f4g5 f6g5
<< info depth 17 seldepth 16 multipv 1 score cp 0 nodes 531134 nps 27954421 tbhits 10795 time 19 pv f2f4 g7g5 f4g5 f6g5
<< info depth 18 seldepth 16 multipv 1 score cp 0 nodes 617453 nps 28066045 tbhits 13828 time 22 pv f2f4 g7g5 f4g5 f6g5
<< info depth 19 seldepth 16 multipv 1 score cp 0 nodes 685106 nps 28546083 tbhits 15991 time 24 pv f2f4 g7g5 f4g5 f6g5
<< info depth 20 seldepth 16 multipv 1 score cp 0 nodes 795278 nps 27423379 tbhits 20162 time 29 pv f2f4 g7g5 f4g5 f6g5
<< info depth 21 seldepth 16 multipv 1 score cp 0 nodes 925172 nps 27210941 tbhits 24442 time 34 pv f2f4 g7g5 f4g5 f6g5
<< info depth 22 seldepth 16 multipv 1 score cp 0 nodes 1142368 nps 27862634 tbhits 31669 time 41 pv f2f4 g7g5 f4g5 f6g5
<< info depth 23 seldepth 16 multipv 1 score cp 0 nodes 1214205 nps 28237325 tbhits 33702 time 43 pv f2f4 g7g5 f4g5 f6g5
<< info depth 24 seldepth 16 multipv 1 score cp 0 nodes 1362514 nps 28989659 tbhits 38853 time 47 pv f2f4 g7g5 f4g5 f6g5
<< info depth 25 seldepth 16 multipv 1 score cp 0 nodes 1863787 nps 30061080 tbhits 54816 time 62 pv f2f4 g7g5 f4g5 f6g5
<< info depth 26 seldepth 16 multipv 1 score cp 0 nodes 2127944 nps 30839768 tbhits 62624 time 69 pv f2f4 g7g5 f4g5 f6g5
<< info depth 27 seldepth 16 multipv 1 score cp 0 nodes 2417402 nps 30992333 tbhits 71939 time 78 pv f2f4 g7g5 f4g5 f6g5
<< info depth 28 seldepth 16 multipv 1 score cp 0 nodes 2913114 nps 31664282 tbhits 86273 time 92 pv f2f4 g7g5 f4g5 f6g5
<< info depth 29 seldepth 16 multipv 1 score cp 0 nodes 3126232 nps 31578101 tbhits 93302 time 99 pv f2f4 g7g5 f4g5 f6g5
<< info depth 30 seldepth 16 multipv 1 score cp 0 nodes 3538467 nps 31878081 tbhits 106379 time 111 pv f2f4 g7g5 f4g5 f6g5
<< info depth 31 seldepth 16 multipv 1 score cp 0 nodes 3929441 nps 32208532 tbhits 118059 time 122 pv f2f4 g7g5 f4g5 f6g5
<< info depth 32 seldepth 16 multipv 1 score cp 0 nodes 4867486 nps 32667691 tbhits 146132 time 149 pv f2f4 g7g5 f4g5 f6g5
<< info depth 33 seldepth 16 multipv 1 score cp 0 nodes 5804616 nps 32980772 tbhits 174327 time 176 pv f2f4 g7g5 f4g5 f6g5
<< info depth 34 seldepth 16 multipv 1 score cp 0 nodes 6813761 nps 33237858 tbhits 203543 time 205 pv f2f4 g7g5 f4g5 f6g5
<< info depth 35 seldepth 16 multipv 1 score cp 0 nodes 7682443 nps 33401926 tbhits 230061 time 230 pv f2f4 g7g5 f4g5 f6g5
<< info depth 36 seldepth 16 multipv 1 score cp 0 nodes 8681738 nps 33391300 tbhits 260570 time 260 pv f2f4 g7g5 f4g5 f6g5
<< info depth 37 seldepth 16 multipv 1 score cp 0 nodes 10218327 nps 33502711 tbhits 307582 time 305 pv f2f4 g7g5 f4g5 f6g5
<< info depth 38 seldepth 16 multipv 1 score cp 0 nodes 11599029 nps 33620373 tbhits 349148 time 345 pv f2f4 g7g5 f4g5 f6g5
<< info depth 39 seldepth 16 multipv 1 score cp 0 nodes 13100128 nps 33763216 tbhits 390047 time 388 pv f2f4 g7g5 f4g5 f6g5
<< info depth 40 seldepth 16 multipv 1 score cp 0 nodes 15043083 nps 33653429 tbhits 446723 time 447 pv f2f4 g7g5 f4g5 f6g5
<< info depth 41 seldepth 16 multipv 1 score cp 0 nodes 16666156 nps 33669002 tbhits 495652 time 495 pv f2f4 g7g5 f4g5 f6g5
<< info depth 42 seldepth 16 multipv 1 score cp 0 nodes 18334005 nps 33640376 tbhits 540724 time 545 pv f2f4 g7g5 f4g5 f6g5
<< info depth 43 seldepth 16 multipv 1 score cp 0 nodes 23974745 nps 33862634 tbhits 702434 time 708 pv f2f4 g7g5 f4g5 f6g5
<< info depth 44 seldepth 16 multipv 1 score cp 0 nodes 30981525 nps 33675570 tbhits 903371 time 920 pv f2f4 g7g5 f4g5 f6g5
<< info depth 45 seldepth 16 multipv 1 score cp 0 nodes 30986468 nps 33680943 tbhits 903505 time 920 pv f2f4 g7g5 f4g5 f6g5
<< info depth 46 seldepth 16 multipv 1 score cp 0 nodes 37530291 nps 33719938 hashfull 33 tbhits 1087536 time 1113 pv f2f4 g7g5 f4g5 f6g5
<< info depth 47 seldepth 16 multipv 1 score cp 0 nodes 39182485 nps 33633034 hashfull 36 tbhits 1131943 time 1165 pv f2f4 g7g5 f4g5 f6g5
<< info depth 48 seldepth 16 multipv 1 score cp 0 nodes 52666127 nps 33630987 hashfull 53 tbhits 1479702 time 1566 pv f2f4 g7g5 f4g5 f6g5
<< info depth 49 seldepth 16 multipv 1 score cp 0 nodes 52671881 nps 33613197 hashfull 53 tbhits 1479832 time 1567 pv f2f4 g7g5 f4g5 f6g5
<< info depth 50 seldepth 16 multipv 1 score cp 0 nodes 65290811 nps 33465305 hashfull 58 tbhits 1805212 time 1951 pv f2f4 g7g5 f4g5 f6g5
<< info depth 51 seldepth 16 multipv 1 score cp 0 nodes 70496331 nps 33300109 hashfull 61 tbhits 1937411 time 2117 pv f2f4 g7g5 f4g5 f6g5
<< info depth 52 seldepth 16 multipv 1 score cp 0 nodes 95749385 nps 33085482 hashfull 90 tbhits 2587283 time 2894 pv f2f4 g7g5 f4g5 f6g5
<< info depth 53 seldepth 16 multipv 1 score cp 0 nodes 117302753 nps 33015128 hashfull 111 tbhits 3145161 time 3553 pv f2f4 g7g5 f4g5 f6g5
<< info depth 54 seldepth 16 multipv 1 score cp 0 nodes 150613034 nps 32985771 hashfull 137 tbhits 3961875 time 4566 pv f2f4 g7g5 f4g5 f6g5
<< info depth 55 seldepth 16 multipv 1 score cp 0 nodes 159026453 nps 32993040 hashfull 147 tbhits 4169902 time 4820 pv f2f4 g7g5 f4g5 f6g5
<< info depth 56 seldepth 16 multipv 1 score cp 0 nodes 245940668 nps 33074323 hashfull 221 tbhits 6280095 time 7436 pv f2f4 g7g5 f4g5 f6g5
<< info depth 57 seldepth 16 multipv 1 score cp 0 nodes 248970251 nps 33076956 hashfull 225 tbhits 6345461 time 7527 pv f2f4 g7g5 f4g5 f6g5

2nd position

Code: Select all

<< info string Found 510 tablebases
>> position fen 8/6pk/7p/8/8/2npPP1P/1RnK2P1/8 b - - 0 1
>> go infinite
<< info depth 1 seldepth 1 multipv 1 score cp -48 nodes 1276 nps 1276000 tbhits 0 time 1 pv c3a4
<< info depth 2 seldepth 2 multipv 1 score cp -56 nodes 4545 nps 2272500 tbhits 0 time 2 pv c2e3 d2d3
<< info depth 3 seldepth 4 multipv 1 score cp 137 nodes 6164 nps 3082000 tbhits 0 time 2 pv c2e3 d2c3 e3d1 c3b3
<< info depth 4 seldepth 4 multipv 1 score cp -46 nodes 8105 nps 4052500 tbhits 0 time 2 pv c2e3 d2d3 c3d1 b2d2
<< info depth 5 seldepth 5 multipv 1 score cp -45 nodes 11000 nps 5500000 tbhits 0 time 2 pv c2e3 b2b3 e3d1 d2d3 h7g6
<< info depth 6 seldepth 6 multipv 1 score cp -37 nodes 16539 nps 8269500 tbhits 0 time 2 pv c2e3 d2d3 e3d1 b2c2 h7g6 c2c3
<< info depth 7 seldepth 8 multipv 1 score cp -43 nodes 26126 nps 13063000 tbhits 0 time 2 pv c2e3 d2d3 h7g6 b2b6 g6h7 d3d4 c3d1 b6b1
<< info depth 8 seldepth 9 multipv 1 score cp -37 nodes 40889 nps 13629666 tbhits 0 time 3 pv c2e3 d2d3 c3d1 b2e2 e3d5 d3d4 d1c3 e2c2 h7g6
<< info depth 9 seldepth 11 multipv 1 score cp -60 nodes 105517 nps 21103400 tbhits 1 time 5 pv c2e3 d2d3 e3d1 b2b3 c3a4 d3d2 d1b2 d2e2 h7g6 b3b7
<< info depth 10 seldepth 11 multipv 1 score cp -66 nodes 125899 nps 20983166 tbhits 1 time 6 pv c2e3 d2d3 h7g6 b2b7 e3d1 d3d2 h6h5 b7c7 h5h4 d2d3
<< info depth 11 seldepth 15 multipv 1 score cp -57 nodes 493188 nps 25957263 tbhits 112 time 19 pv c2e3 d2d3 c3a4 b2b4 e3d1 h3h4 h7g6 d3d2 d1b2 g2g4 g6f7
<< info depth 12 seldepth 21 multipv 1 score cp -66 nodes 620000 nps 26956521 tbhits 132 time 23 pv c2e3 d2d3 c3a4 b2b4 e3d1 d3d2 d1b2 h3h4 h7g6 g2g4 g6f7 f3f4 f7g6 f4f5 g6f6
<< info depth 13 seldepth 21 multipv 1 score cp -86 nodes 1039089 nps 28863583 tbhits 1251 time 36 pv c2e3 d2c3 e3d1 c3b3 d1b2 b3b2 h7g6 b2c3 g6g5 g2g3 d3d2 c3d2 h6h5 h3h4 g5f5 d2c3 g7g6 c3d4 f5e6 d4e4 e6f6
<< info depth 14 seldepth 21 multipv 1 score cp -91 nodes 1132388 nps 29035589 tbhits 1573 time 39 pv c2e3 d2c3 e3d1 c3b3 d1b2 b3b2 h7g6 b2c3 g6g5 g2g3 d3d2 c3d2 g5f6 h3h4 f6e5 d2d3 g7g6 d3e3 e5f6 e3e4
<< info depth 15 seldepth 23 multipv 1 score cp -96 nodes 1352884 nps 28784765 tbhits 2258 time 47 pv c2e3 d2c3 e3d1 c3b3 d1b2 b3b2 h7g6 b2c3 g6f5 g2g3 f5e5 c3d3 h6h5 d3e3 e5f5 h3h4 f5e5 e3e2 e5d4 e2d2 g7g6
<< info depth 16 seldepth 26 multipv 1 score cp -75 nodes 1471544 nps 28853803 tbhits 3532 time 51 pv c2e3 d2c3 e3d1 c3b3 d1b2 b3b2 h7g6 g2g3 h6h5 h3h4 g6f5 b2c3 f5e5 c3d3 e5d5 d3e2 d5e6 e2d2 e6d6 d2e3 d6e5
<< info depth 17 seldepth 28 multipv 1 score cp -77 nodes 1590965 nps 28926636 tbhits 4482 time 55 pv c2e3 d2c3 e3d1 c3b3 d1b2 b3b2 h7g6 b2c3 g6f5 g2g3 h6h5 h3h4 f5e5 c3d3 e5d5 d3c3 d5e5 c3c4 e5e6 c4d4
<< info depth 18 seldepth 29 multipv 1 score cp -62 nodes 1836528 nps 29151238 tbhits 5835 time 63 pv c2e3 d2c3 e3d1 c3b3 d1b2 b3b2 h7g6 b2c3 g6f5 g2g3 h6h5 h3h4 f5e5 c3d3 e5d5 d3e2 d5e6 e2f2 e6f5 f2e3 f5e5 f3f4 e5f5 e3f3 g7g6 f3e3 f5g4
<< info depth 19 seldepth 30 multipv 1 score cp -62 nodes 2217463 nps 26087800 tbhits 8912 time 85 pv c2e3 d2c3 e3d1 c3b3 d1b2 b3b2 h7g6 b2c3 g6f5 g2g3 h6h5 h3h4 f5e5 c3d3 e5d5 d3e2 d5e6 e2f2 e6f5 f2e3 f5e5 f3f4 e5f5 e3f3 g7g6 f3e3 f5g4 e3f2 g4f5 f2f3
<< info depth 20 seldepth 36 multipv 1 score cp -62 nodes 2230783 nps 26244505 tbhits 9000 time 85 pv c2e3 d2c3 e3d1 c3b3 d1b2 b3b2 h7g6 g2g3 h6h5 h3h4 g6f5 b2c3 f5e5 c3d3 e5d5 d3d2 d5d6 d2c3 d6c5 c3c2 c5c6 c2c1 c6c5 c1d1 c5d5 d1e2 d5e6 e2f1 e6d6 f1f2 d6d5 f2e3 d5e5 f3f4 e5f5 e3f3
<< info depth 21 seldepth 36 multipv 1 score cp -62 nodes 2446290 nps 26024361 tbhits 9953 time 94 pv c2e3 d2c3 e3d1 c3b3 d1b2 b3b2 h7g6 g2g3 g6f5 b2c3 h6h5 h3h4 f5e5 c3d3 e5d5 d3d2 d5d6 d2c3 d6c5 c3c2 c5c6 c2c1 c6c5 c1d1 c5d5 d1e2 d5e6 e2f1 e6d6 f1f2 d6d5 f2e3 d5e5 f3f4 e5f5 e3f3
<< info depth 22 seldepth 36 multipv 1 score cp -61 nodes 6611367 nps 28253705 tbhits 18063 time 234 pv c2e3 d2d3 e3d5 d3d4 c3a4 b2b3 d5e7 b3b7 e7f5 d4e5 f5e3 g2g4 e3g2 e5d4 g2f4 b7b4 a4c5 d4c5 f4d3 c5c4 d3b4 c4b4 h7g6 b4c5
<< info depth 23 seldepth 36 multipv 1 score cp -54 nodes 12666029 nps 28917874 tbhits 30068 time 438 pv c2e3 d2d3 e3d5 d3d4 c3a4 b2b3 d5c7 b3b4 c7e6 d4d5 a4c5 b4c4 h7g6 c4c5 e6c5 d5c5 h6h5 h3h4 g6f5 g2g3 f5e5 c5c4 e5e6 c4d4 e6d6 d4e4 d6e6 e4e3 e6e5 e3d3
<< info depth 24 seldepth 36 multipv 1 score cp -53 nodes 13778649 nps 28946741 tbhits 33706 time 476 pv c2e3 d2d3 e3d5 d3d4 c3a4 b2b7 d5f4 b7b4 f4e6 d4d5 a4c5 b4c4 h7g6 c4c5 e6c5 d5c5 h6h5 h3h4 g6f5 g2g3 f5e5 c5c4 e5e6 c4d4 e6d6 d4e3 d6e5 e3d3 e5d5 f3f4 d5e6 d3e4 g7g6 e4d4 e6f5
<< info depth 25 seldepth 36 multipv 1 score cp -53 nodes 18050930 nps 28743519 tbhits 50661 time 628 pv c2e3 d2d3 e3d5 d3d4 c3a4 b2b7 d5f4 b7b4 f4e6 d4d5 a4c5 b4c4 h7g6 c4c5 e6c5 d5c5 h6h5 h3h4 g6f5 g2g3 f5e5 c5c4 e5e6 c4d4 e6d6 d4e3 d6e5 e3d3 e5d5 d3e2 d5e6 e2d2 e6d6 d2c3 d6c5 c3c2
<< info depth 26 seldepth 43 multipv 1 score cp -51 nodes 23565138 nps 29128724 tbhits 67560 time 809 pv c2e3 d2d3 e3d5 d3d4 c3a4 b2b7 d5f4 b7b4 f4e6 d4e5 a4c5 b4b5 h7g6 h3h4 h6h5 e5d6 g6f5 g2g3 f5f6 b5c5 e6c5 d6c5 f6e5 c5c4 e5e6 c4d4 e6d6 d4e3 d6e5 e3d3 e5d5 d3e2 d5e6 e2d2 e6d6 f3f4 d6e6 d2e3 e6f5 e3f3 g7g6 f3e3 f5g4
<< info depth 27 seldepth 43 multipv 1 score cp -51 nodes 27757483 nps 29310964 tbhits 80311 time 947 pv c2e3 d2d3 e3d5 d3d4 c3a4 b2b7 d5f4 b7b4 f4e6 d4e5 a4c5 b4b5 h7g6 h3h4 h6h5 e5d6 g6f5 g2g3 f5f6 b5c5 e6c5 d6c5 f6e5 c5c4 e5e6 c4d4 e6d6 d4e3 d6e5 e3d3 e5d5 d3e2 d5e6 e2d2 e6d6 d2c3 d6c5 c3c2 c5c6 f3f4 c6d5 c2d3
<< info depth 28 seldepth 43 multipv 1 score cp -51 nodes 40678435 nps 29056025 hashfull 57 tbhits 128274 time 1400 pv c2e3 d2d3 e3d5 d3d4 c3a4 b2b3 d5e7 d4c4 e7c8 c4b5 a4b6 b5c6 h7g6 b3b6 c8b6 c6b6 g6g5 g2g3 h6h5 h3h4 g5f5 b6c5 f5e5 c5c4 e5e6 c4d4 e6d6 d4e3 d6e5 e3d3 e5d5 d3e2 d5e6 e2d2 e6d6
<< info depth 29 seldepth 43 multipv 1 score cp -51 nodes 53676970 nps 29444306 hashfull 75 tbhits 179497 time 1823 pv c2e3 d2d3 e3d5 d3d4 c3a4 b2b3 d5e7 d4c4 e7c8 c4b5 a4b6 b5c6 h7g6 b3b6 c8b6 c6b6 g6g5 g2g3 h6h5 h3h4 g5f5 b6c5 f5e5 c5c4 e5e6 c4d4 e6d6 d4e3 d6e5 e3d3 e5d5 d3e2 d5e6 e2d1 e6d5 d1e1 d5e5 e1f2 e5d5
<< info depth 30 seldepth 43 multipv 1 score cp -51 nodes 75536938 nps 29774118 hashfull 100 tbhits 335845 time 2537 pv c2e3 d2d3 e3d5 d3d4 c3a4 b2b3 d5f4 b3b4 a4c5 d4c5 f4d3 c5b5 d3b4 b5b4 h7g6 h3h4 g6f5 g2g3 h6h5 b4c5 f5e5 c5c4 e5e6 c4d4 e6d6 d4e3 d6e5 e3f2 e5d5 f2e2 d5e6 e2d1 e6d5 d1c2 d5e6 c2d3 e6d5 f3f4 d5e6 d3e4
<< info depth 31 seldepth 48 multipv 1 score cp -51 nodes 80647284 nps 29748168 hashfull 106 tbhits 368630 time 2711 pv c2e3 d2d3 e3d5 d3d4 c3a4 b2b3 d5f4 b3b4 a4c5 d4c5 f4d3 c5b5 d3b4 b5b4 h7g6 h3h4 h6h5 b4c5 g6f5 g2g3 f5e5 c5c4 e5e6 c4d4 e6d6 d4e3 d6e5 e3f2 e5d5 f2f1 d5d6 f1e2 d6e6 e2d1 e6d5 d1d2 d5d6 d2c2 d6e6 c2c3 e6e5 c3d3 e5d5 f3f4 d5e6 d3e3
<< info depth 32 seldepth 48 multipv 1 score cp -44 lowerbound nodes 114070225 nps 29923983 hashfull 148 tbhits 555610 time 3812 pv c2e3
<< info depth 32 seldepth 48 multipv 1 score cp -43 nodes 156143280 nps 30266191 hashfull 202 tbhits 885164 time 5159 pv c2e3 d2d3 h7g6 d3c3 e3d1 c3c2 d1b2 c2b2 g6g5 g2g3 g5f5 h3h4 h6h5 b2b3 f5f6 b3c2 f6e6 c2d3 e6d5 d3e3 d5e5 e3f2 e5d5 f2f1 d5d6 f1e1 d6e5 e1d1 e5d5 d1e2 d5e6 f3f4 e6f5 e2f3 f5e6 f3e4 g7g6 e4f3 e6f6 f3e2 f6e6
<< info depth 33 seldepth 48 multipv 1 score cp -36 lowerbound nodes 190224101 nps 30504185 hashfull 241 tbhits 1101232 time 6236 pv c2e3
<< info depth 33 seldepth 48 multipv 1 score cp -29 lowerbound nodes 285440900 nps 30838472 hashfull 334 tbhits 1786058 time 9256 pv c2e3
<< info depth 33 seldepth 48 multipv 1 score cp -26 nodes 349081246 nps 30960642 hashfull 398 tbhits 2220478 time 11275 pv c2e3 d2d3 h7g6 g2g3 e3d5 d3d4 g6f5 b2b3 h6h5 h3h4 f5e6 b3c3 d5c3 d4c3 e6e5 c3d2 e5d6 d2e2 d6e6 e2f1 e6f5 f1f2 f5f6 f2e1 f6e5 e1d1 e5d5 f3f4 d5e6 d1d2 e6f6 d2e3 f6f5 e3f2 f5f6 f2f3 f6e6 f3e4 e6f6 e4d4 f6e6 d4d3 e6f6 d3e4
<< info depth 34 seldepth 48 multipv 1 score cp -33 upperbound nodes 468038756 nps 31225482 hashfull 519 tbhits 3020581 time 14989 pv c2e3 d2d3
<< info depth 34 seldepth 50 multipv 1 score cp -40 upperbound nodes 538618559 nps 31304112 hashfull 579 tbhits 3558418 time 17206 pv c2e3 d2d3
<< info depth 34 seldepth 53 multipv 1 score cp -33 lowerbound nodes 612302160 nps 31348666 hashfull 631 tbhits 4035047 time 19532 pv c2e3
<< info depth 34 seldepth 53 multipv 1 score cp -42 upperbound nodes 640860466 nps 31387034 hashfull 652 tbhits 4226348 time 20418 pv c2e3 d2d3
<< info depth 34 seldepth 53 multipv 1 score cp -48 nodes 689623497 nps 31446579 hashfull 677 tbhits 4552878 time 21930 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b7 c3d1 d3d4 d5e3 b7b1 e3f5 d4e5 d1e3 b1b6 g6f7 b6b3 g7g6 b3c3 e3g2 c3c7 f7g8 c7c4 g8f7 c4b4 f5e7 b4b3 h6h5 f3f4 e7f5 b3b7 f7g8 b7b2 g2e3 e5f6 f5g3 f6g6 g8f8 b2b3 e3f5 g6f6 f8e8 b3b8 e8d7
<< info depth 35 seldepth 53 multipv 1 score cp -55 upperbound nodes 844548463 nps 31664234 hashfull 757 tbhits 5673130 time 26672 pv c2e3 d2d3
<< info depth 35 seldepth 53 multipv 1 score cp -48 lowerbound nodes 910078765 nps 31712271 hashfull 786 tbhits 6105236 time 28698 pv c2e3
<< info depth 35 seldepth 53 multipv 1 score cp -37 lowerbound nodes 933549941 nps 31728577 hashfull 795 tbhits 6292994 time 29423 pv c2e3
<< info depth 35 seldepth 56 multipv 1 score cp -29 nodes 1118131285 nps 31847426 hashfull 870 tbhits 7660183 time 35109 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b7 c3d1 d3d4 d5e3 b7b1 e3f5 d4e5 f5e3 b1b3 h6h5 f3f4 e3c2 f4f5 g6h7 f5f6 h7g6 f6g7 g6g7 h3h4 g7g6 e5f4 d1f2 b3b6 g6g7 b6d6 c2b4 f4f5 f2h1 d6g6 g7f7 g6g5 b4d3 f5e4 d3e1 e4e3 f7f6 e3e2 e1c2 e2f3 c2e1 f3e3
<< info depth 36 seldepth 56 multipv 1 score cp -33 nodes 1197198507 nps 31886179 hashfull 893 tbhits 8266883 time 37546 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b7 c3d1 d3d4 d5e3 b7b6 g6h7 b6b5 h7g6 b5b1 e3f5 d4e5 f5e3 b1b3 h6h5 f3f4 e3c2 f4f5 g6h6 f5f6 h6g6 f6g7 g6g7 h3h4 g7g6 b3b6 g6h7 b6b1 d1f2 e5f4 h7g6 b1b6 g6g7 b6a6 c2b4 a6a5 g7h6 a5f5 b4c2 f5f6 h6h7 f6c6 f2h3 f4e5 c2e3 e5e4
<< info depth 37 seldepth 56 multipv 1 score cp -35 nodes 1299003629 nps 31892259 hashfull 910 tbhits 9147359 time 40731 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b7 c3d1 d3d4 d5e3 b7b1 e3f5 d4e5 f5e3 b1b3 h6h5 f3f4 e3c2 f4f5 g6h6 f5f6 h6g6 f6g7 g6g7 e5f4 d1f2 b3b7 g7f6 b7b6 f6f7 h3h4 f7g7 b6a6 c2b4 a6d6 b4c2 d6b6 c2e1 b6e6 g7f7 e6h6 e1d3 f4f3 d3e5 f3g2 f2g4 h6h5 g4e3 g2f2 e3g4 f2f1
<< info depth 38 seldepth 56 multipv 1 score cp -28 lowerbound nodes 1370095012 nps 31925039 hashfull 925 tbhits 9644937 time 42916 pv c2e3
<< info depth 38 seldepth 65 multipv 1 score cp -27 nodes 1524849616 nps 31994998 hashfull 945 tbhits 10746738 time 47659 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b7 c3d1 d3d4 d5e3 b7b6 g6h7 b6b5 h7g6 b5b1 e3f5 d4e5 f5e3 b1b3 h6h5 h3h4 e3f1 b3b6 g6f7 b6b7 f7g6 b7b1 f1e3 b1c1 d1f2 c1a1 f2d3 e5e4 d3b4 a1b1 e3d5 e4d4 d5e7 b1b4 e7c6 d4c4 c6b4 c4b4 g6f5 b4c3 f5e5 c3d3 e5d5 d3e2 d5e6 e2d2 e6d6 d2e1 d6e5 e1f2 e5f6 f2g2 f6e5 g2h3 e5f5
<< info depth 39 seldepth 65 multipv 1 score cp -24 nodes 1634121210 nps 31939511 hashfull 957 tbhits 11619246 time 51163 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b7 c3d1 d3d4 d5e3 b7b1 e3f5 d4e5 f5e3 b1b3 h6h5 h3h4 e3f1 b3b1 f1e3 b1c1 d1f2 c1a1 f2d3 e5e4 d3b4 a1b1 e3d5 e4d4 d5e7 b1b4 e7c6 d4c4 c6b4 c4b4 g6f5 b4c3 f5e5 c3d3 e5d5 d3d2 d5d6 d2e3 d6e5 e3f2 e5d5 f2f1 d5d6 f1e1 d6e5 e1d1 e5d5 d1e2
<< info depth 40 seldepth 65 multipv 1 score cp -23 nodes 1798808379 nps 31920365 hashfull 975 tbhits 13084443 time 56353 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b7 c3d1 d3d4 d5e3 b7b1 e3f5 d4e5 f5e3 b1b3 h6h5 h3h4 e3f1 b3b1 f1e3 b1c1 d1f2 c1a1 f2d3 e5e4 d3b4 a1b1 e3d5 e4d4 d5e7 b1b4 e7c6 d4c4 c6b4 c4b4 g6f5 b4c3 f5e5 c3c4 e5e6 c4d3 e6d5 f3f4 d5d6 d3e4 d6e6 e4e3 e6f5 e3f2 f5e6 f2f1 e6d6 f1e2 d6e6 e2f2 e6f6 f2f3
<< info depth 41 seldepth 65 multipv 1 score cp -23 nodes 2147031824 nps 31973192 hashfull 989 tbhits 15949275 time 67151 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b7 c3d1 d3d4 d5e3 b7b1 e3f5 d4e5 f5e3 b1b3 h6h5 h3h4 e3f1 b3b1 f1e3 b1c1 d1f2 c1a1 f2d3 e5e4 d3b4 a1b1 e3d5 e4d4 d5e7 b1b4 e7c6 d4c4 c6b4 c4b4 g6f5 b4c3 f5e5 c3c4 e5e6 c4d4 e6d6 d4d3 d6d5 d3e3 d5e5 e3d2 e5d6 d2e1 d6e5 e1f2 e5d5 f2e2 d5e6 e2f1 e6f5 f1f2 f5f6 f2g2
<< info depth 42 seldepth 65 multipv 1 score cp -16 lowerbound nodes 2424553745 nps 31982399 hashfull 994 tbhits 18182716 time 75809 pv c2e3
<< info depth 42 seldepth 65 multipv 1 score cp -8 lowerbound nodes 3411888825 nps 32054573 hashfull 999 tbhits 25648433 time 106440 pv c2e3
<< info depth 42 seldepth 65 multipv 1 score cp 0 nodes 5253038461 nps 32109429 hashfull 999 tbhits 38102743 time 163598 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b8 c3d1 d3e4 d5c3 e4e5 c3e2 b8d8 d1b2 g3g4 e2g1 d8d6 g6f7 d6d7 f7g8 d7d8 g8f7 d8d7
<< info depth 43 seldepth 65 multipv 1 score cp 0 nodes 5263494719 nps 32108380 hashfull 999 tbhits 38169825 time 163929 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b3 h6h5 d3d4 g6f5 h3h4 f5e6 b3c3 d5c3 d4c3 e6e5 c3c2 e5e6 c2d2 e6d6 d2e3 d6e5 e3f2 e5f5 f2e1 f5e5 e1e2 e5e6 e2d1 e6d5 d1e1 d5e5
<< info depth 44 seldepth 65 multipv 1 score cp 0 nodes 5359489646 nps 32095250 hashfull 999 tbhits 38927902 time 166987 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b3 h6h5 d3d4 g6f5 h3h4 f5e6 b3c3 d5c3 d4c3 e6e5 c3c2 e5e6 c2d2 e6d6 d2e3 d6e5 e3f2 e5f5 f2e1 f5e5 e1e2 e5e6 e2d1 e6d5 d1e1 d5e5
<< info depth 45 seldepth 65 multipv 1 score cp 0 nodes 5437536893 nps 32065675 hashfull 999 tbhits 39647334 time 169575 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b3 h6h5 d3d4 g6f5 h3h4 f5e6 b3c3 d5c3 d4c3 e6e5 c3c2 e5e6 c2d2 e6d6 d2e3 d6e5 e3f2 e5f5 f2e1 f5e5 e1e2 e5e6 e2d1 e6d5 d1e1 d5e5
<< info depth 46 seldepth 65 multipv 1 score cp 0 nodes 5666766322 nps 32015628 hashfull 999 tbhits 41791660 time 177000 pv c2e3 d2d3 h7g6 g2g3 e3d5 b2b3 h6h5 d3d4 g6f5 h3h4 f5e6 b3c3 d5c3 d4c3 e6e5 c3c2 e5e6 c2d2 e6d6 d2e3 d6e5 e3f2 e5f5 f2e1 f5e5 e1e2 e5e6 e2d1 e6d5 d1e1 d5e5
<< info depth 47 seldepth 65 multipv 1 score cp 0 nodes 5765121425 nps 31989176 hashfull 999 

bug in asmfish perhaps?

https://github.com/MichaelB7/Stockfish/ ... der_Option

[Spliffjiffer]

you both tested with different conditions as i did:

jouni used multipv and used too low time for pos2...SF will change from Nxe3 to Nd5 later on missevaluating the pawn ending

michael used tb's

[Eelco de Groot]

you both tested with different conditions as i did:

jouni used multipv and used too low time for pos2...SF will change from Nxe3 to Nd5 later on missevaluating the pawn ending

michael used tb's

The latest Stockfish development version from today, TDM-GCC compile. I have no TBs installed, and it does not find pos 1. Unless by some luck I think, Rainbow Serpent sometimes finds the f4 draw almost immediately and then holds it, but that is pure chance, in some runs.


8/1p4p1/5k2/5p2/8/3K3P/5PP1/8 w - -

Engine: Stockfish development version, 7threads, i7 6700 BMI2, 20161203 HT,512 MB
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

30/58 0:00 -0.08 1.f4 b5 2.Kd4 Ke6 3.Kc5 b4 4.Kxb4 Kd5
5.Kb5 g6 6.h4 Ke4 7.Kc6 Kxf4 8.Kd5 Kg3
9.Ke5 Kxg2 10.Kf4 Kh3 11.Kg5 f4
12.h5 gxh5 13.Kxf4 h4 14.Kf3 (15.171.407) 15689

31/68 0:03 -1.83-- 1.f4 Ke6 (51.115.467) 15336

31/68 0:03 -1.83 1.Kd4 f4 2.Kc5 Kf5 3.Kb6 Ke4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qe4 13.Qa2+ Kf3 14.Qb3+ (55.935.564) 15299

32/68 0:04 -1.90-- 1.Kd4 f4 (62.642.908) 15410

32/68 0:04 -1.97-- 1.Kd4 f4 (67.997.047) 15415

32/68 0:04 -2.08-- 1.Kd4 f4 (73.121.616) 15452

32/68 0:05 -2.24-- 1.Kd4 f4 (79.652.742) 15487

32/68 0:05 -2.24 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Kd4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (84.612.829) 15400

33/69 0:06 -2.31-- 1.Kd4 f4 (95.957.244) 15422

33/70 0:07 -2.38-- 1.Kd4 f4 (115.631.147) 15460

33/70 0:08 -2.49-- 1.Kd4 f4 (124.749.717) 15525

33/78 0:08 -2.54 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Kd4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (135.660.151) 15566

34/83 0:10 -2.54 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Kd4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (155.093.173) 15464

35/83 0:12 -2.61-- 1.Kd4 f4 (199.429.689) 15518

35/83 0:12 -2.61 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Kd4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (201.422.793) 15515

36/83 0:15 -2.68-- 1.Kd4 f4 (238.664.627) 15412

36/83 0:15 -2.68 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Kd4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (240.212.385) 15415

37/86 0:18 -2.75-- 1.Kd4 f4 (283.314.182) 15453

37/86 0:18 -2.75 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Kd4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (291.263.127) 15457

38/86 0:21 -2.83-- 1.Kd4 f4 (337.819.377) 15486

38/86 0:25 -2.90-- 1.Kd4 f4 (388.661.624) 15487

38/86 0:25 -2.83++ 1.Kd4 (400.116.591) 15511

38/86 0:27 -2.91-- 1.Kd4 f4 (428.610.070) 15545

38/89 0:31 -3.12-- 1.Kd4 f4 (495.072.941) 15569

38/89 0:38 -3.37 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Kd4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (603.359.689) 15572

39/89 0:42 -3.44-- 1.Kd4 f4 (655.945.280) 15599

39/89 0:42 -3.52-- 1.Kd4 f4 (658.764.865) 15599

39/89 0:42 -3.62-- 1.Kd4 f4 (661.659.003) 15598

39/89 0:44 -3.65 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Kd4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (701.079.566) 15610

40/89 0:47 -3.58++ 1.Kd4 (743.640.863) 15616

40/89 0:47 -3.65-- 1.Kd4 f4 (745.333.116) 15619

40/89 0:49 -3.76-- 1.Kd4 f4 (767.323.171) 15649

40/89 0:49 -3.91-- 1.Kd4 f4 (769.990.706) 15654

40/89 0:53 -4.02 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Ke4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (833.477.522) 15722

41/92 1:03 -4.10-- 1.Kd4 f4 (998.522.290) 15648

41/92 1:06 -4.10 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Ke4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (1.043.500.612) 15667

42/104 1:18 -4.17-- 1.Kd4 f4 (1.230.497.442) 15697

42/104 1:19 -4.17 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Ke4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (1.248.944.057) 15708

43/104 1:20 -4.17 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Ke4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (1.262.304.382) 15709

44/104 1:29 -4.17 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Ke4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (1.406.589.437) 15657

45/104 2:27 -4.24-- 1.Kd4 f4 (2.315.724.250) 15726

45/104 2:28 -4.24 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Ke4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (2.328.485.048) 15732

46/104 2:32 -4.24 1.Kd4 f4 2.Kc5 Ke5 3.Kb6 Ke4 4.Kxb7 Kd3
5.g4 g5 6.f3 Ke2 7.h4 gxh4 8.g5 h3
9.g6 h2 10.g7 h1Q 11.g8Q Qxf3+
12.Kb8 Qc6 13.Qa2+ Kf3 14.Qb3+ (2.407.290.907) 15754

best move: Kd3-d4 time: 2:32.954 min n/s: 15.754.006 nodes: 2.407.290.907

[yanquis1972]

you both tested with different conditions as i did:

jouni used multipv and used too low time for pos2...SF will change from Nxe3 to Nd5 later on missevaluating the pawn ending

michael used tb's

confirm no TBs single PV latest SF likes Kd4, very weird

[Jouni]

First position is good example about tablebase benefit. Just checked, that downloading full 5 piece set from sesse.net took 2,5 minutes. You can't afford that ? SF should forbid use without syzygy!

[MikeB]

you both tested with different conditions as i did:

jouni used multipv and used too low time for pos2...SF will change from Nxe3 to Nd5 later on missevaluating the pawn ending

michael used tb's

no tb's? that helps you in your analysis?

[MikeB]

you both tested with different conditions as i did:

jouni used multipv and used too low time for pos2...SF will change from Nxe3 to Nd5 later on missevaluating the pawn ending

michael used tb's

confirm no TBs single PV latest SF likes Kd4, very weird

actually I'm not seeing that with multilple threads - single pv, no tb it finds and sticks with f4 , and yes I do see Kd4 in single thread mode

Code: Select all

setoption name Threads value 18
setoption name Hash value 2048
position fen 8/1p4p1/5k2/5p2/8/3K3P/5PP1/8 w - - 0 1
go infinite
info depth 1 seldepth 1 multipv 1 score cp -1 nodes 156 nps 52000 tbhits 0 time 3 pv d3e3
info depth 2 seldepth 2 multipv 1 score cp 2 nodes 863 nps 172600 tbhits 0 time 5 pv d3c4 g7g5
info depth 3 seldepth 3 multipv 1 score cp -13 nodes 1412 nps 282400 tbhits 0 time 5 pv d3c4 g7g5 f2f3
info depth 4 seldepth 4 multipv 1 score cp -9 nodes 3440 nps 430000 tbhits 0 time 8 pv d3c3 b7b5 h3h4 f5f4
info depth 5 seldepth 5 multipv 1 score cp -8 nodes 6527 nps 652700 tbhits 0 time 10 pv d3c4 g7g6 c4b5 g6g5 b5c5
info depth 6 seldepth 7 multipv 1 score cp 6 nodes 15761 nps 985062 tbhits 0 time 16 pv d3c4 f6e5 h3h4 f5f4 g2g4 f4g3
info depth 7 seldepth 8 multipv 1 score cp 2 nodes 24609 nps 1171857 tbhits 0 time 21 pv d3c4 f6e5 h3h4 e5d6 h4h5 f5f4 g2g4
info depth 8 seldepth 8 multipv 1 score cp 8 nodes 36658 nps 1409923 tbhits 0 time 26 pv d3c4 f6e5 c4c5 g7g5 c5b6 e5f6 f2f3 f5f4 b6b7
info depth 9 seldepth 10 multipv 1 score cp 2 nodes 65966 nps 1782864 tbhits 0 time 37 pv d3c4 f6e5 c4c5 e5e4 c5b6 f5f4 f2f3 e4e3 b6c5 e3f2
info depth 10 seldepth 10 multipv 1 score cp 15 nodes 74046 nps 1898615 tbhits 0 time 39 pv d3c4 f5f4 c4c5 f4f3 g2g3 f6e5 c5b6 e5d4 b6b7 g7g5
info depth 11 seldepth 11 multipv 1 score cp 15 nodes 90028 nps 1915489 tbhits 0 time 47 pv d3c4 f5f4 c4c5 f4f3 g2g3 f6e5 c5b6 e5d4 b6b7 g7g5 b7c6
info depth 12 seldepth 14 multipv 1 score cp 2 nodes 336890 nps 2406357 tbhits 0 time 140 pv d3d4 f5f4 d4e4 f4f3 g2g3 f6e6 e4f3 e6d5 f3e2 b7b5 e2d3 b5b4
info depth 13 seldepth 19 multipv 1 score cp 0 nodes 529991 nps 2649955 tbhits 0 time 200 pv f2f4 g7g5 f4g5 f6g5 g2g3 b7b5 d3c3 b5b4 c3c4 f5f4 h3h4 g5g4 g3f4 g4f4 h4h5
info depth 14 seldepth 19 multipv 1 score cp 0 nodes 604269 nps 2734248 tbhits 0 time 221 pv f2f4 g7g5 f4g5 f6g5 g2g3 b7b5 d3c3 b5b4 c3c4 f5f4 h3h4 g5g4 g3f4 g4f4 h4h5 b4b3 c4b3
info depth 15 seldepth 20 multipv 1 score cp -8 nodes 1114892 nps 3419914 tbhits 0 time 326 pv d3d4 f5f4 d4e4 f6g5 g2g3 b7b5 e4d5 g5f5 d5d4 b5b4 d4c4 f5e4 c4b4 e4f3 g3f4 f3f2
info depth 16 seldepth 22 multipv 1 score cp -10 nodes 1218686 nps 3563409 tbhits 0 time 342 pv d3d4 f5f4 d4e4 f6g5 g2g3 b7b5 e4d5 g5f5 d5d4 b5b4 d4c4 f5e4 c4b4 e4f3 g3f4 f3f2 b4c5 f2f3 f4f5
info depth 17 seldepth 24 multipv 1 score cp -36 nodes 3385325 nps 6269120 tbhits 0 time 540 pv d3d4 f5f4 d4e4 f6g5 g2g3 b7b5 e4d4 g5f5 d4d5 f4f3 d5d4 b5b4 d4c4 f5e4 h3h4 b4b3 c4c3 b3b2 c3c2 g7g6 c2b2 e4d3
info depth 18 seldepth 28 multipv 1 score cp -32 nodes 4983135 nps 8169073 tbhits 0 time 610 pv f2f4 b7b5 d3d4 f6e6 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c5 e4f4 c5d4 f4g3 d4e5 g3g2 e5f4 g2f2 f4g5 f2e3 g5g6 f5f4 h4h5 f4f3 h5h6 f3f2
info depth 19 seldepth 33 multipv 1 score cp -12 nodes 5559249 nps 8810220 tbhits 0 time 631 pv f2f4 b7b5 d3d4 f6e6 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c5 e4f4 c5d5 f4g3 d5e5 g3g2 e5f4 g2h3 f4g5 h3g3 g5g6 f5f4 h4h5
info depth 20 seldepth 33 multipv 1 score cp -9 nodes 5728856 nps 8993494 tbhits 0 time 637 pv f2f4 b7b5 d3d4 f6e6 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c6 e4f4 c6d5 f4g3 d5e5 g3g2 e5f4 g2h3 f4g5 h3g3 g5g6 f5f4 h4h5 f4f3 h5h6 f3f2 h6h7 f2f1q h7h8q
info depth 21 seldepth 45 multipv 1 score cp -8 nodes 5984275 nps 9263583 tbhits 0 time 646 pv f2f4 b7b5 d3d4 f6e6 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c6 e4f4 c6d5 f4g3 d5e5 g3g2 e5f4 g2h3 f4g5 h3g3 g5g6 f5f4 h4h5 f4f3 h5h6 f3f2 h6h7 f2f1q h7h8q f1d3 g6f7 d3d7 f7g6 d7d6 h8f6 d6f6 g6f6 g3g4 f6g6 g4h4 g6f7
info depth 22 seldepth 45 multipv 1 score cp -8 nodes 6632028 nps 9943070 tbhits 0 time 667 pv f2f4 b7b5 d3d4 f6e6 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c6 e4f4 c6d5 f4g4 d5e5 g4g3 h4h5 g6h5 e5f5 g3g2 f5g5 g2g3 g5h5 g3f3 h5g6 f3e4 g6f7
info depth 23 seldepth 45 multipv 1 score cp -8 nodes 6801507 nps 10121290 tbhits 0 time 672 pv f2f4 b7b5 d3d4 f6e6 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c6 e4f4 c6d5 f4g4 d5e5 g4g3 h4h5 g6h5 e5f5 g3g2 f5g5 g2g3 g5h5 g3f3 h5g6 f3e4 g6f7 e4d4 f7g8 d4d3 g8f7
info depth 24 seldepth 45 multipv 1 score cp -8 nodes 7270552 nps 10521782 tbhits 0 time 691 pv f2f4 b7b5 d3d4 f6e6 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c6 e4f4 c6d5 f4g4 d5e5 g4g3 h4h5 g6h5 e5f5 g3g2 f5g5 h5h4 g5h4 g2f3 h4h5 f3e4 h5g5 e4e5
info depth 25 seldepth 45 multipv 1 score cp -9 nodes 10185357 nps 12844081 tbhits 0 time 793 pv f2f4 f6e6 d3c4 b7b5 c4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c6 e4f4 c6d5 f4g3 d5e5 g3g2 e5f4 g2h3 f4g5 h3g3 g5g6 f5f4 h4h5 f4f3 h5h6
info depth 26 seldepth 45 multipv 1 score cp -8 nodes 10961967 nps 13384575 tbhits 0 time 819 pv f2f4 b7b5 d3d4 f6e6 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c5 e4f4 c5d6 f4g4 d6e5 g4g3 h4h5 g6h5 e5f5 g3g2 f5g5 h5h4 g5h4 g2f3 h4h5 f3e4 h5g5 e4e5 g5h5 e5d4 h5g6 d4d5 g6f6
info depth 27 seldepth 45 multipv 1 score cp -8 nodes 15522873 nps 16019476 tbhits 0 time 969 pv f2f4 f6e6 d3d4 e6d6 d4c4 b7b5 c4b5 d6d5 h3h4 g7g6 b5b6 d5e4 b6c5 e4f4 c5d6 f4g3 d6e5 g3g2 e5f4 g2h3 f4g5 h3g3 g5g6 f5f4 h4h5 f4f3 h5h6 f3f2 h6h7 f2f1q h7h8q f1d3 g6f7 d3d5 f7g6 d5e4 g6f7 e4c4 f7g6 c4g4 g6f7 g4d7 f7g6
info depth 28 seldepth 45 multipv 1 score cp -12 nodes 16648774 nps 16582444 hashfull 7 tbhits 0 time 1004 pv f2f4 f6e6 d3d4 e6d6 d4c4 b7b5 c4b5 d6d5 h3h4 g7g6 b5b6 d5e4 b6c5 e4f4 c5d6 f4g3 d6e5 g3g2 e5f4 g2h3 f4g5 h3g3 g5g6 f5f4 h4h5 f4f3 h5h6 f3f2 h6h7 f2f1q h7h8q f1d3 g6f7 d3c4 f7e7 c4c7 e7f8
info depth 29 seldepth 45 multipv 1 score cp -8 nodes 19507743 nps 17946405 hashfull 10 tbhits 0 time 1087 pv f2f4 f6e6 d3d4 e6d6 d4c4 d6c6 g2g4 b7b5 c4d4 f5g4 h3g4 c6d6 f4f5 b5b4 g4g5 b4b3 d4c3 d6e5 f5f6 g7f6 g5f6 e5f6 c3b3 f6f5 b3c3 f5e5 c3b3 e5d4 b3b4 d4d3 b4b3 d3e2 b3c2
info depth 30 seldepth 45 multipv 1 score cp -8 nodes 24539571 nps 20032302 hashfull 13 tbhits 0 time 1225 pv f2f4 b7b5 d3d4 f6e6 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4c3 d5e4 c3c4 e4f4 c4d5 f4g3 d5e5 g3g2 e5f4 g2h3 f4g5 f5f4 h4h5 g6h5 g5f4 h5h4 f4f3 h3h2 f3f2 h4h3 f2f1 h2g3
info depth 31 seldepth 45 multipv 1 score cp -8 nodes 29928501 nps 22071165 hashfull 17 tbhits 0 time 1356 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4c3 d5e4 c3c4 e4f4 c4d5 f4g3 d5e5 g3g2 e5f4 g2h3 f4g5 f5f4 h4h5 g6h5 g5f4 h5h4 f4f3 h3h2 f3f2 h4h3 f2f1 h2g3 f1g1 g3f4 g1h2 f4g4 h2h1 g4f5
info depth 32 seldepth 45 multipv 1 score cp -8 nodes 37881231 nps 24423746 hashfull 19 tbhits 0 time 1551 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c5 e4f4 c5d6 f4g3 d6e5 g3h4 e5f4 h4h5 g2g3 h5h6 g3g4 f5g4 f4g4 g6g5 g4g3 h6h5 g3h3 g5g4 h3g2 h5g5 g2g1 g4g3 g1h1 g5f5 h1g2 f5g4 g2g1
info depth 33 seldepth 47 multipv 1 score cp -8 nodes 49892016 nps 27443353 hashfull 26 tbhits 0 time 1818 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c5 e4f4 c5d6 f4g3 d6e5 g3h4 e5f4 h4h5 g2g3 h5h6 g3g4 f5g4 f4g4 g6g5 g4g3 h6h5 g3h3 g5g4 h3g2 h5h4 g2h2 g4g3 h2g1 h4g5 g1h1 g5f5 h1g2 f5g4 g2g1 g4h3 g1h1 g3g2 h1g1 h3g4 g1g2
info depth 34 seldepth 48 multipv 1 score cp 0 nodes 60427698 nps 29448195 hashfull 33 tbhits 0 time 2052 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c5 e4f4 c5d6 f4g3 d6e5 g3g2 e5f4 g2h3 f4g5 h3g3 g5g6 f5f4 h4h5 f4f3 h5h6 f3f2 h6h7 f2f1q h7h8q f1d3 g6f7 d3f5 h8f6 f5d5 f7f8 d5e4 f6g7 g3h4 g7h6 h4g3 h6g5 g3h3 g5h5 h3g3 h5g5
info depth 35 seldepth 48 multipv 1 score cp 0 nodes 68621826 nps 30744545 hashfull 41 tbhits 0 time 2232 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c5 e4f4 c5d6 f4g3 d6e5 g3g2 e5f4 g2h3 f4g5 h3g3 g5g6 f5f4 h4h5 f4f3 h5h6 f3f2 h6h7 f2f1q h7h8q f1d3 g6f7 d3f5 h8f6 f5d5 f7f8 d5e4 f6g7 g3h4 g7h6 h4g3 h6g5 g3h3 g5h5 h3g3 h5g5
info depth 36 seldepth 48 multipv 1 score cp 0 nodes 89200019 nps 33345801 hashfull 52 tbhits 0 time 2675 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c5 e4f4 c5d6 f4g3 d6e5 g3g2 e5f4 g2h3 f4g5 h3g3 g5g6 f5f4 h4h5 f4f3 h5h6 f3f2 h6h7 f2f1q h7h8q f1d3 g6f7 d3f5 h8f6 f5d5 f7f8 d5e4 f6g7 g3h4 g7h6 h4g3 h6g5 g3h3 g5h5 h3g3 h5g5
info depth 37 seldepth 48 multipv 1 score cp 0 lowerbound nodes 124264938 nps 36029265 hashfull 81 tbhits 0 time 3449 pv f2f4
info depth 37 seldepth 48 multipv 1 score cp 0 nodes 124412938 nps 36040827 hashfull 81 tbhits 0 time 3452 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c4 e4f4 c4d5 f4g3 d5e5 g3h4 e5f4 h4h5 g2g3 h5h6 g3g4 f5g4 f4g4 g6g5 g4g3 h6h5 g3h3 g5g4 h3g2 h5h4 g2h2 g4g3 h2g1 h4h5 g1g2 h5g4 g2g1 g4h4 g1g2 h4g4
info depth 38 seldepth 48 multipv 1 score cp 0 nodes 141382348 nps 37412635 hashfull 91 tbhits 0 time 3779 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c4 e4f4 c4d5 f4g3 d5e5 g3h4 e5f4 h4h5 g2g3 h5h6 g3g4 f5g4 f4g4 g6g5 g4g3 h6h5 g3h3 g5g4 h3g2 h5h4 g2h2 g4g3 h2g1 h4h5 g1g2 h5g4 g2g1 g4h4 g1g2 h4g4
info depth 39 seldepth 48 multipv 1 score cp 0 nodes 274743072 nps 45173145 hashfull 119 tbhits 0 time 6082 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c4 e4f4 c4d5 f4g3 d5e5 g3h4 e5f4 h4h5 g2g3 h5h6 g3g4 f5g4 f4g4 g6g5 g4g3 h6h5 g3h3 g5g4 h3g2 h5h4 g2h2 g4g3 h2g1 h4h5 g1g2 h5g4 g2g1 g4h4 g1g2 h4g4
info depth 40 seldepth 48 multipv 1 score cp 0 nodes 296610282 nps 46165024 hashfull 122 tbhits 0 time 6425 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c4 e4f4 c4d5 f4g3 d5e5 g3h4 e5f4 h4h5 g2g3 h5h6 g3g4 f5g4 f4g4 g6g5 g4g3 h6h5 g3h3 g5g4 h3g2 h5h4 g2h2 g4g3 h2g1 h4h5 g1g2 h5g4 g2g1 g4h4 g1g2 h4g4
info depth 41 seldepth 48 multipv 1 score cp 0 nodes 599064430 nps 53511784 hashfull 183 tbhits 0 time 11195 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c4 e4f4 c4d5 f4g3 d5e5 g3h4 e5f4 h4h5 g2g3 h5h6 g3g4 f5g4 f4g4 g6g5 g4g3 h6h5 g3h3 g5g4 h3g2 h5h4 g2h2 g4g3 h2g1 h4h5 g1g2 h5g4 g2g1 g4h4 g1g2 h4g4
info depth 42 seldepth 48 multipv 1 score cp 0 nodes 717738156 nps 55398128 hashfull 195 tbhits 0 time 12956 pv f2f4 f6e6 d3d4 b7b5 d4c5 b5b4 c5b4 e6d5 h3h4 g7g6 b4b5 d5e4 b5c4 e4f4 c4d5 f4g3 d5e5 g3h4 e5f4 h4h5 g2g3 h5h6 g3g4 f5g4 f4g4 g6g5 g4g3 h6h5 g3h3 g5g4 h3g2 h5h4 g2h2 g4g3 h2g1 h4h5 g1g2 h5g4 g2g1 g4h4 g1g2 h4g4

[Joerg Oster]

you both tested with different conditions as i did:

jouni used multipv and used too low time for pos2...SF will change from Nxe3 to Nd5 later on missevaluating the pawn ending

michael used tb's

confirm no TBs single PV latest SF likes Kd4, very weird

actually I'm not seeing that with multilple threads - single pv, no tb it finds and sticks with f4 , and yes I do see Kd4 in single thread mode

That's because using multiple threads as well as MultiPV analysis or TBs, is simply covering the underlying issue. But that doesn't mean it's not there ...