Stockfish-dev with default settings (16 MB hash and single-threaded, deterministic search) needs about 172 million nodes to find Qg6:
info depth 35 seldepth 51 multipv 1 score cp -365 lowerbound nodes 171929033 nps 1976877 hashfull 1000 tbhits 0 time 86970 pv d6g6
info depth 34 currmove d6g6 currmovenumber 1
info depth 35 seldepth 51 multipv 1 score cp -351 lowerbound nodes 172165946 nps 1976624 hashfull 1000 tbhits 0 time 87101 pv d6g6
info depth 33 currmove d6g6 currmovenumber 1
info depth 35 seldepth 51 multipv 1 score cp -331 lowerbound nodes 172335433 nps 1976550 hashfull 1000 tbhits 0 time 87190 pv d6g6
info depth 32 currmove d6g6 currmovenumber 1
info depth 35 seldepth 51 multipv 1 score cp -305 lowerbound nodes 172431167 nps 1976424 hashfull 1000 tbhits 0 time 87244 pv d6g6
info depth 31 currmove d6g6 currmovenumber 1
info depth 35 seldepth 51 multipv 1 score cp -269 lowerbound nodes 172584594 nps 1976212 hashfull 1000 tbhits 0 time 87331 pv d6g6
info depth 30 currmove d6g6 currmovenumber 1
info depth 35 seldepth 51 multipv 1 score cp -222 lowerbound nodes 172787832 nps 1975892 hashfull 1000 tbhits 0 time 87448 pv d6g6
info depth 29 currmove d6g6 currmovenumber 1
info depth 35 seldepth 51 multipv 1 score cp -161 lowerbound nodes 173334357 nps 1975297 hashfull 1000 tbhits 0 time 87751 pv d6g6
info depth 28 currmove d6g6 currmovenumber 1
info depth 35 seldepth 51 multipv 1 score cp -83 lowerbound nodes 173562031 nps 1974988 hashfull 1000 tbhits 0 time 87880 pv d6g6
info depth 27 currmove d6g6 currmovenumber 1
info depth 35 seldepth 51 multipv 1 score cp 16 lowerbound nodes 173910556 nps 1974595 hashfull 1000 tbhits 0 time 88074 pv d6g6
info depth 26 currmove d6g6 currmovenumber 1
info depth 35 seldepth 51 multipv 1 score cp 144 lowerbound nodes 174250511 nps 1974263 hashfull 1000 tbhits 0 time 88261 pv d6g6
info depth 25 currmove d6g6 currmovenumber 1
info depth 35 seldepth 55 multipv 1 score cp 305 lowerbound nodes 177152544 nps 1976134 hashfull 1000 tbhits 0 time 89646 pv d6g6
info depth 24 currmove d6g6 currmovenumber 1
info depth 24 currmove c5e3 currmovenumber 2
info depth 24 currmove f5e4 currmovenumber 3
info depth 24 currmove d6d5 currmovenumber 4
info depth 24 currmove d6f8 currmovenumber 5
info depth 24 currmove f5d7 currmovenumber 6
info depth 24 currmove d6e6 currmovenumber 7
info depth 24 currmove d6d7 currmovenumber 8
info depth 24 currmove c5d4 currmovenumber 9
info depth 24 currmove c5b6 currmovenumber 10
info depth 24 currmove d6f6 currmovenumber 11
info depth 24 currmove h8h3 currmovenumber 12
info depth 24 currmove g7g6 currmovenumber 13
info depth 24 currmove a5b7 currmovenumber 14
info depth 24 currmove d8d7 currmovenumber 15
info depth 24 currmove c8b7 currmovenumber 16
info depth 24 currmove h8h1 currmovenumber 17
info depth 24 currmove d6h6 currmovenumber 18
info depth 24 currmove d8f8 currmovenumber 19
info depth 24 currmove c8b8 currmovenumber 20
info depth 24 currmove c8d7 currmovenumber 21
info depth 24 currmove f5e6 currmovenumber 22
info depth 24 currmove a5c4 currmovenumber 23
info depth 24 currmove d6c7 currmovenumber 24
info depth 24 currmove d6e7 currmovenumber 25
info depth 24 currmove h8h2 currmovenumber 26
info depth 24 currmove h8h5 currmovenumber 27
info depth 24 currmove a5b3 currmovenumber 28
info depth 24 currmove h8e8 currmovenumber 29
info depth 24 currmove h8h4 currmovenumber 30
info depth 24 currmove d8e8 currmovenumber 31
info depth 24 currmove h8f8 currmovenumber 32
info depth 24 currmove d6d4 currmovenumber 33
info depth 24 currmove c8c7 currmovenumber 34
info depth 24 currmove h8h7 currmovenumber 35
info depth 24 currmove f5g6 currmovenumber 36
info depth 24 currmove g7g5 currmovenumber 37
info depth 24 currmove d6b8 currmovenumber 38
info depth 24 currmove f5h7 currmovenumber 39
info depth 24 currmove h8g8 currmovenumber 40
info depth 24 currmove a7a6 currmovenumber 41
info depth 24 currmove c5a3 currmovenumber 42
info depth 24 currmove c5b4 currmovenumber 43
info depth 24 currmove d8g8 currmovenumber 44
info depth 24 currmove h8h6 currmovenumber 45
info depth 24 currmove d6d3 currmovenumber 46
info depth 35 seldepth 55 multipv 1 score cp 408 nodes 180919306 nps 1974885 hashfull 1000 tbhits 0 time 91610 pv d6g6 f1h1 h8h1 e1h1 c5e3 h1h4 d8f8 f2e3 f5e4 g2g1 e4f3 e2f3 g4f3 g1f2 a5b7 a1f1 g6e6 f1h1 e5e4 h4h3 c8d7 d3d4 b7d6 h3e6 d7e6 h1h5 g7g6 h5g5
Crafty-25.2 (16 MB hash and 1 thread) finds Qg6 in less than 10 seconds and in fewer than 66 million nodes.
Code: Select all
Crafty v25.2 (20 threads)
White(1): mt = 0
parallel threads disabled.
White(1): hash = 16M
hash table memory = 16M bytes (1M entries).
White(1): setb 2kr3r/p5p1/2pq4/n1b1pb2/4N1p1/3PB1P1/PPP1BPK1/R3QR2 b - - 0 20
Black(1): d
+---+---+---+---+---+---+---+---+
8 | | . |<K>|<R>| | . | |<R>|
+---+---+---+---+---+---+---+---+
7 |<P>| | . | | . | |<P>| |
+---+---+---+---+---+---+---+---+
6 | | . |<P>|<Q>| | . | | . |
+---+---+---+---+---+---+---+---+
5 |<N>| |<B>| |<P>|<B>| . | |
+---+---+---+---+---+---+---+---+
4 | | . | | . |-N-| . |<P>| . |
+---+---+---+---+---+---+---+---+
3 | . | | . |-P-|-B-| |-P-| |
+---+---+---+---+---+---+---+---+
2 |-P-|-P-|-P-| . |-B-|-P-|-K-| . |
+---+---+---+---+---+---+---+---+
1 |-R-| | . | |-Q-|-R-| . | |
+---+---+---+---+---+---+---+---+
a b c d e f g h
Black(1): st = 10
search time set to 10.00.
Black(1): go
time surplus 0.00 time limit 10.00 (10.00)
depth time score variation (1)
19 1.12/10.00 2.12 1. ... Bxe4+ 2. dxe4 Bxe3 3. Bxg4+ Kb7
4. Qxe3 Qd4 5. Qxd4 Rxd4 6. Rfd1 Rhd8
7. Rxd4 Rxd4 8. Rd1 Nc4 9. Rxd4 exd4
10. b3 Ne5 11. Be6 c5 12. Bd5+ Kc7
19-> 1.27/10.00 2.12 1. ... Bxe4+ 2. dxe4 Bxe3 3. Bxg4+ Kb7
4. Qxe3 Qd4 5. Qxd4 Rxd4 6. Rfd1 Rhd8
7. Rxd4 Rxd4 8. Rd1 Nc4 9. Rxd4 exd4
10. b3 Ne5 11. Be6 c5 12. Bd5+ Kc7
20 2.00/10.00 2.18 1. ... Bxe4+ 2. dxe4 Bxe3 3. Bxg4+ Kc7
4. Qxe3 Qd4 5. Qxd4 Rxd4 6. Rfd1 Rhd8
7. b3 Rd2 8. Rxd2 Rxd2 9. c4 Kd6 10. Rd1
Rxd1 11. Bxd1 Kc5 12. Bg4
20-> 2.16/10.00 2.18 1. ... Bxe4+ 2. dxe4 Bxe3 3. Bxg4+ Kc7
4. Qxe3 Qd4 5. Qxd4 Rxd4 6. Rfd1 Rhd8
7. b3 Rd2 8. Rxd2 Rxd2 9. c4 Kd6 10. Rd1
Rxd1 11. Bxd1 Kc5 12. Bg4
21 2.71/10.00 2.15 1. ... Bxe4+ 2. dxe4 Bxe3 3. Bxg4+ Kc7
4. Qxe3 Qd4 5. Qxd4 Rxd4 6. Rfd1 Rhd8
7. b3 Rd2 8. Rxd2 Rxd2 9. c4 Kd6 10. Rd1
Rxd1 11. Bxd1 Kc5 12. Bg4 Kd4
21-> 2.85/10.00 2.15 1. ... Bxe4+ 2. dxe4 Bxe3 3. Bxg4+ Kc7
4. Qxe3 Qd4 5. Qxd4 Rxd4 6. Rfd1 Rhd8
7. b3 Rd2 8. Rxd2 Rxd2 9. c4 Kd6 10. Rd1
Rxd1 11. Bxd1 Kc5 12. Bg4 Kd4
22 4.57/10.00 2.19 1. ... Bxe4+ 2. dxe4 Bxe3 3. Bxg4+ Kc7
4. Qxe3 Qd4 5. Qxd4 Rxd4 6. Rfd1 Nc4 7. c3
Rdd8 8. b3 Nd6 9. Kf3 Nb5 10. Rac1 Rxd1
11. Rxd1 Nxc3 12. Rd7+ Kb6 13. a3 g5
time=10.09(100%) nodes=65877778(65.9M) fh1=87% pred=0 nps=6.5M
chk=1.6M qchk=2.6M fp=23.7M mcp=7.4M 50move=1
LMReductions: 1/1.2M 2/764.3K 3/662.7K 4/430.3K 5/63.9K 6/2.2K
null-move (R): 3/2.0M 4/206.2K 5/9.1K 6/178
Black(1): Qg6
time used: 10.09