Amazing tactic played by a middle school boy!

[Pafifi]

[d]3qnrk1/5p1p/pp1ppPp1/n3P3/P7/B3Q3/B1r3PP/R4RK1 w - - 0 1
[pgn]
[FEN "3qnrk1/5p1p/pp1ppPp1/n3P3/P7/B3Q3/B1r3PP/R4RK1 w - - 0 1"]

1. Bxe6! (1. Bxd6? 1. .. Nxd6 2. exd6 Kh8 3. Qh6 Rg8 4. Bxe6 Qxd6 5. Rad1
(5. Bxf7 Qc5+ 6. Kh1 Qf8 7. Qxf8 Rxf8 8. Rac1 Rxc1 9. Rxc1 b5 10. Rc7 bxa4
11. Re7 Nc6=) 5. .. Qf8=) (1. Bd5? 1. .. exd5 2. Qh6 Nc4 3. Rf3 Nxe5 4. Rh3
Nxf6-+) (1. Qh6? Qa8 2. Rf3 Qe4 3. Raf1 Qg4 4. Rg3 Qd4+ 5. Re3 Qd2 6. Qh3
Rxa2 7. Bxd6 Nxd6 8. exd6 Nc4-+) 1. .. fxe6 {Real game play} (1. .. Qa8
{Maybe better but still losing} 2. Qh3 (2. Qg3? fxe6 3. f7+ Rxf7 4. Rxf7
Kxf7-+) 2. .. Qe4 3. Rae1 Qd4+ 4. Kh1 Rf2 5. exd6 (5. Bxd6? Nxd6 6. exd6
Qxf6 7. Rxf2 Qxf2 8. Rc1 fxe6 9. Qxe6+ Qf7-+) 5. .. Nxf6 6. d7 Ne4 7. Rg1
Nc5 8. Bg4 Nc6 9. Re8 Nxd7 10. Bxd7 Rxe8 11. Bxe8 Nb4 12. Qh6 Qf4 13. Qxf4
Rxf4 14. Rd1+-) 2. f7+ Rxf7 3. Rxf7 Kxf7 4. Rf1+ Kg8 5. exd6 Nf6 6. Qxe6+
Kg7 7. Bc1 h6 8. g3 g5 9. h4+- *
[/pgn]
Stockfish, Sting SF and Crystal all failed to find 1. Bxe6 on my computer. However, the white side is played by a middle school boy!

[yurikvelo]

Code: Select all

23	 48 804k	0,48	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
23	 48 804k	0,54	1.Qe4 Rc3 2.Bb4 Rc7 3.Rad1 Nb7 4.
23	 48 804k	0,69	1.exd6 Nxf6 2.Qd3 Rc6 3.Bb2 Nd7 4
23	 48 804k	0,89	1.Bb3 Nxb3 2.Qxb3 Qc7 3.Rac1 Rxc1
23	 48 804k	0,94	1.Qd3 Qc7 2.Rac1 Rxc1 3.Rxc1 Qd7
23	 48 804k	1,29	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
---------------------------------------------------------------------------			
24	 59 396k	0,79	1.Qd3 Qc7 2.Rac1 Rxc1 3.Rxc1 Qd7
24	 59 396k	0,8	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
24	 59 396k	1	1.Qe4 Rc3 2.Bb4 Rc7 3.Rad1 Nb7 4.
24	 59 396k	1,13	1.Bb3 Nxb3 2.Qxb3 Qc7 3.Rac1 Rxc1
24	 59 396k	1,26	1.exd6 Nxf6 2.Qd3 Rc6 3.Bb2 Nd7 4
24	 59 396k	1,4	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
---------------------------------------------------------------------------			
25	 86 481k	0,77	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
25	 86 481k	0,87	1.exd6 Nxf6 2.Qd3 Rc6 3.Bb2 Nd7 4
25	 86 481k	0,91	1.Bb3 Nxb3 2.Qxb3 Qc8 3.Rfc1 Rxc1
25	 86 481k	1,15	1.Qd3 Qc7 2.Rac1 Rxc1 3.Rxc1 Qd8
25	 86 481k	1,27	1.Qe4 Rd2 2.Qf4 Re2 3.exd6 Qd7 4.
25	 86 481k	1,34	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
---------------------------------------------------------------------------			
26	 0 115 178k	0,81	1.Qd3 Qc7 2.Rac1 Rxc1 3.Rxc1 Qd8
26	 0 115 178k	0,87	1.Kh1 Qa8 2.Qh3 Nb7 3.a5 bxa5 4.B
26	 0 115 178k	0,97	1.exd6 Nxf6 2.Qd3 Rc6 3.Bb2 Nd7 4
26	 0 115 178k	1,03	1.Qe4 Rc3 2.Bb4 Rc7 3.Rad1 Rd7 4.
26	 0 115 178k	1,46	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
26	 0 115 178k	1,49	1.Bb3 Nxb3 2.Qxb3 Qc8 3.Rfc1 Rxc1
---------------------------------------------------------------------------			
27	 0 156 357k	1	1.exd6 Nxf6 2.Qd3 Rc6 3.Bb2 Nd7 4
27	 0 156 357k	1,11	1.Kh1 Qa8 2.Qh3 Qc8 3.exd6 Qd7 4.
27	 0 156 357k	1,14	1.Qe4 Rc3 2.Bb4 Rc7 3.Rad1 Rd7 4.
27	 0 156 357k	1,27	1.Bb3 Nxb3 2.Qxb3 Rc6 3.Qe3 b5 4.
27	 0 156 357k	1,3	1.Qd3 Qc7 2.Rac1 Rxc1 3.Rxc1 Qd8
27	 0 156 357k	1,44	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
---------------------------------------------------------------------------			
28	 0 216 823k	0,65	1.exd6 Nxf6 2.Qd3 Rc6 3.Bb2 Nd7 4
28	 0 216 823k	0,98	1.Qd3 Qc7 2.Rac1 Rxc1 3.Rxc1 Qd7
28	 0 216 823k	0,98	1.Qe4 Rd2 2.Qf4 Re2 3.exd6 Qd7 4.
28	 0 216 823k	1,05	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
28	 0 216 823k	1,15	1.Bb3 Nxb3 2.Qxb3 Rc6 3.Qe3 b5 4.
28	 0 216 823k	1,53	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
---------------------------------------------------------------------------			
29	 0 292 986k	0,61	1.Kh1 Qa8 2.Qh3 Qc8 3.exd6 Qd7 4.
29	 0 292 986k	0,88	1.exd6 Nxf6 2.Qd3 Rc6 3.Bb2 Nd7 4
29	 0 292 986k	1,05	1.Qd3 Qc7 2.Bxe6 fxe6 3.f7+ Rxf7
29	 0 292 986k	1,12	1.Qe4 Rc3 2.Bb4 Rc7 3.Rad1 Rd7 4.
29	 0 292 986k	1,37	1.Bxe6 Qa8 2.Qh3 Re2 3.Rae1 Rxe1
29	 0 292 986k	1,5	1.Bb3 Nxb3 2.Qxb3 Qc7 3.Rac1 Rxc1
---------------------------------------------------------------------------			
30	 0 364 146k	0,92	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
30	 0 364 146k	0,95	1.Kh1 Qa8 2.Qh3 Qc8 3.exd6 Qd7 4.
30	 0 364 146k	1,15	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
30	 0 364 146k	1,23	1.Qd3 Qc7 2.Bxe6 fxe6 3.f7+ Rxf7
30	 0 364 146k	1,46	1.Bb3 Rc5 2.Bxc5 bxc5 3.Rad1 Qb6
30	 0 364 146k	1,61	1.Qe4 Rc3 2.Bb4 Rc7 3.Rad1 Nb7 4.
---------------------------------------------------------------------------			
31	 0 468 095k	0,55	1.Kh1 Qa8 2.Qh3 Qc8 3.exd6 Qd7 4.
31	 0 468 095k	1,06	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
31	 0 468 095k	1,15	1.Qd3 Qc7 2.Bxe6 fxe6 3.f7+ Rxf7
31	 0 468 095k	1,36	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
31	 0 468 095k	1,53	1.Bb3 Nxb3 2.Qxb3 Qc7 3.Rac1 Rxc1
31	 0 468 095k	1,65	1.Qe4 Rc3 2.Bb4 Rc7 3.Rad1 Nb7 4.
---------------------------------------------------------------------------			
32	 0 562 117k	1,01	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
32	 0 562 117k	1,3	1.Qe4 Rc3 2.Bb4 Rc7 3.Rad1 Nb7 4.
32	 0 562 117k	1,34	1.Qd3 Qc7 2.Bxe6 fxe6 3.f7+ Rxf7
32	 0 562 117k	1,48	1.Bb3 Nxb3 2.Qxb3 Rc6 3.Qe3 b5 4.
32	 0 562 117k	1,51	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
32	 0 562 117k	1,55	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
---------------------------------------------------------------------------			
33	 0 647 750k	0,96	1.Kh1 Qa8 2.Qh3 Qb7 3.exd6 Qd7 4.
33	 0 647 750k	1,32	1.Qd3 Qc7 2.Bxe6 fxe6 3.f7+ Rxf7
33	 0 647 750k	1,33	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
33	 0 647 750k	1,4	1.Qe4 Rc3 2.Bb4 Rc7 3.Rad1 Nb7 4.
33	 0 647 750k	1,52	1.Bb3 Nxb3 2.Qxb3 Rc6 3.Qe3 b5 4.
33	 0 647 750k	1,56	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
---------------------------------------------------------------------------			
34	 0 819 909k	1	1.Kh1 Qa8 2.Qh3 Qb7 3.exd6 Qd7 4.
34	 0 819 909k	1,23	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
34	 0 819 909k	1,35	1.Qd3 Qc7 2.Bxe6 fxe6 3.f7+ Rxf7
34	 0 819 909k	1,45	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
34	 0 819 909k	1,54	1.Qe4 Rc3 2.Bb4 Rc7 3.Rad1 Rd7 4.
34	 0 819 909k	1,61	1.Bb3 Nxb3 2.Qxb3 Qc7 3.Rac1 Rxc1
---------------------------------------------------------------------------			
35	 1 096 898k	1,11	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
35	 1 096 898k	1,22	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
35	 1 096 898k	1,33	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
35	 1 096 898k	1,34	1.Qd3 Qc7 2.Bxe6 fxe6 3.f7+ Rxf7
35	 1 096 898k	1,69	1.Bb3 Nxb3 2.Qxb3 Qc7 3.Rac1 Rxc1
35	 1 096 898k	1,83	1.Qe4 Rd2 2.Qf4 Re2 3.Bxd6 Nxd6 4
---------------------------------------------------------------------------			
36	 1 327 032k	1,13	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
36	 1 327 032k	1,3	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
36	 1 327 032k	1,55	1.Bb3 Nxb3 2.Qxb3 Qc8 3.Rac1 Rxc1
36	 1 327 032k	1,69	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
36	 1 327 032k	1,76	1.Qd3 Qc7 2.Bxe6 fxe6 3.f7+ Rxf7
36	 1 327 032k	1,99	1.Qe4 Rd2 2.Qf4 dxe5 3.Qh6 Rd6 4.
---------------------------------------------------------------------------			
37	 1 676 247k	1,19	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
37	 1 676 247k	1,43	1.Qd3 Qc7 2.Bxe6 Qc3 3.Qxc3 Rxc3
37	 1 676 247k	1,44	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
37	 1 676 247k	1,46	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
37	 1 676 247k	1,73	1.Qe4 Rd2 2.Bxe6 dxe5 3.Be7 Qd4+
37	 1 676 247k	1,89	1.Bb3 Nxb3 2.Qxb3 Qc8 3.Rac1 Rxc1
---------------------------------------------------------------------------			
38	 2 040 938k	0,63	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
38	 2 040 938k	1,05	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
38	 2 040 938k	1,22	1.Qd3 Qc7 2.Bxe6 Qc3 3.Qxc3 Rxc3
38	 2 040 938k	1,29	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
38	 2 040 938k	1,68	1.Qe4 Rd2 2.Bxe6 dxe5 3.Be7 Qd4+
38	 2 040 938k	1,85	1.Bb3 Nxb3 2.Qxb3 Qc8 3.Rac1 Rxc1
---------------------------------------------------------------------------			
39	 2 544 416k	0,56	1.Kh1 Rxa2 2.Rxa2 Nc4 3.Qh6 Nxe5
39	 2 544 416k	1,27	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
39	 2 544 416k	1,34	1.Qd3 Qc7 2.Bxe6 Qc3 3.Qxc3 Rxc3
39	 2 544 416k	1,49	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
39	 2 544 416k	1,58	1.Bb3 Nxb3 2.Qxb3 Re2 3.exd6 Rd2
39	 2 544 416k	2,03	1.Qe4 Rc6 2.Qh4 b5 3.axb5 axb5 4.
---------------------------------------------------------------------------			
40	 3 091 929k	1,15	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
40	 3 091 929k	1,3	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
40	 3 091 929k	1,45	1.Qd3 Qc7 2.Bxe6 Qc3 3.Qxc3 Rxc3
40	 3 091 929k	1,73	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
40	 3 091 929k	1,77	1.Qe4 Rd2 2.Bxe6 dxe5 3.Be7 Qd4+
40	 3 091 929k	1,94	1.Bb3 Nxb3 2.Qxb3 Qc7 3.Rac1 Rxc1
---------------------------------------------------------------------------			
41	 3 664 278k	1,18	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
41	 3 664 278k	1,35	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
41	 3 664 278k	1,44	1.Qd3 Qc7 2.Bxe6 Qc3 3.Qxc3 Rxc3
41	 3 664 278k	1,53	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
41	 3 664 278k	1,75	1.Bb3 Nxb3 2.Qxb3 Qc7 3.Rac1 Rxc1
41	 3 664 278k	1,92	1.Qe4 Rd2 2.Bxe6 dxe5 3.Be7 Qd4+
---------------------------------------------------------------------------			
42	 4 376 854k	1,21	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
42	 4 376 854k	1,28	1.Qd3 Qc7 2.Bxe6 Qc3 3.Qxc3 Rxc3
42	 4 376 854k	1,63	1.Bxe6 fxe6 2.f7+ Rxf7 3.Rxf7 Kxf
42	 4 376 854k	1,75	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
42	 4 376 854k	1,93	1.Bb3 Nxb3 2.Qxb3 Qc7 3.Rac1 Rxc1
42	 4 376 854k	1,94	1.Qe4 Rd2 2.Bxe6 dxe5 3.Be7 Qd4+
---------------------------------------------------------------------------			
43	5 521 235k	1,21	1.Kh1 Qa8 2.Qh3 Nb7 3.Bxe6 Nc5 4.
43	5 521 235k	1,28	1.Qd3 Qc7 2.Bxe6 Qc3 3.Qxc3 Rxc3
43	5 521 235k	1,75	1.exd6 Nxf6 2.Qd3 Rc6 3.Rae1 b5 4
43	5 521 235k	1,84	1.Qe4 Rd2 2.Bxe6 dxe5 3.Be7 Qd4+
43	5 521 235k	2,08	1.Bb3 Nxb3 2.Qxb3 Qc7 3.Rac1 Rxc1
43	5 521 235k	2,28	1.Bxe6 Qa8 2.Qh3 Qe4 3.Rae1 Qd4+

Bxe6 fails low and high among best moves for a long time.
Clear fail-high happens at D=43
1.Bb3 is also ~2, which is most time higher than 1.Bxe6 Qa8

1. Bxe6 is that good only in expectation of 1. .. fxe6?
after 1. .. Qa8, Bxe6 is not much better than 1.Bb3

Code: Select all

D=44
+1,84	1. ... Qa8 2.Qh3 Qe4 3.Rae1 Qd4+
+3,36	1. ... fxe6 2.f7+ Rxf7 3.Rxf7 Kxf7

engines are prohibited to know opponent ELO-strength, they cannot play Bxe6 in expectation of fxe6, because it can be Houdini, Komodo or Lc0 playing black

[zullil]

1. Bxe6 is that good only in expectation of 1. .. fxe6?
after 1. .. Qa8, Bxe6 is not much better than 1.Bb3

Code: Select all

D=44
+1,84	1. ... Qa8 2.Qh3 Qe4 3.Rae1 Qd4+
+3,36	1. ... fxe6 2.f7+ Rxf7 3.Rxf7 Kxf7

engines are prohibited to know opponent ELO-strength, they cannot play Bxe6 in expectation of fxe6, because it can be Houdini, Komodo or Lc0 playing black

Bxe6 seems clearly best:

info depth 41 seldepth 80 multipv 1 score cp 331 nodes 1271760652 nps 37481893 hashfull 216 tbhits 0 time 33930 pv a2e6 d8a8 e3h3 a8e4 a1e1 e4d4 g1h1 c2f2 e5d6 e8f6 d6d7 f6e4 f1g1 e4c5 e6g4 a5c6 e1e8 c5d7 g4d7 f8e8 d7e8 c6b4 h3c8 g8g7 h2h3 b4c2 a3e7 c2e3 e8c6 h7h5 c8b8 f2f5 e7d6 g7h7 d6c7 e3c4 b8e8 d4h8 e8e7 h8f6 e7f6 f5f6 c6d7 b6b5 a4b5 a6b5 d7b5 c4e3 g1c1 f6e6 c1c5 f7f6 h1g1

info depth 41 seldepth 59 multipv 2 score cp 205 nodes 1271760652 nps 37481893 hashfull 216 tbhits 0 time 33930 pv e3e4 c2d2 a2e6 d6e5 a3e7 d8d4 e4d4 d2d4 e6a2 a5c6 a1b1 b6b5 e7f8 g8f8 a4b5 a6b5 b1b5 e5e4 b5b7 c6e5 b7e7 e5c4 a2b3 c4d6 e7a7 e4e3 a7a8 d6e4 b3c2 e3e2 f1e1 e4f6 e1e2 d4d7 g1f2 d7e7 e2e7 f8e7 a8a7 e7f8 f2e3 e8d6 c2b3 g6g5 b3a4 d6f5 e3d3 f6d5 d3e4 f5e7 e4e5 d5f4 e5f6 e7d5 f6g5 f4g2

info depth 41 seldepth 52 multipv 3 score cp 199 nodes 1271760652 nps 37481893 hashfull 216 tbhits 0 time 33930 pv a2b3

[AdminX]

Fat Fritz believes that Bxe6 is best met by Qa8 Qh6 Qe4.

Analysis by Fat Fritz (in lc0) rtx:

1.Bb3 Nxb3 2.Qxb3 Rc6 3.Qe3 b5 4.Rad1 h5 5.h3 Kh7 6.exd6 Qd7 7.axb5 axb5 8.Rd3 Rc4 9.Bc1 b4 10.Qh6+ Kg8 11.Kh1 Rc8 12.Bf4 Rc2 13.Qg5 Re2 14.Rfd1 Re4 15.Be3 Kh7 16.Rf1 Kg8 17.Qh6 b3 18.Rxb3 Qxd6 19.Rb5 Qd3 20.Rxh5 Qxf1+ 21.Kh2
White is clearly better: +/- (74% +59% =30% -11%) Depth: 30/78 01:08:18 48087kN, tb=234

[zullil]

Fat Fritz believes that Bxe6 is best met by Qa8 Qh6 Qe4.

Analysis by Fat Fritz (in lc0) rtx:

1.Bb3 Nxb3 2.Qxb3 Rc6 3.Qe3 b5 4.Rad1 h5 5.h3 Kh7 6.exd6 Qd7 7.axb5 axb5 8.Rd3 Rc4 9.Bc1 b4 10.Qh6+ Kg8 11.Kh1 Rc8 12.Bf4 Rc2 13.Qg5 Re2 14.Rfd1 Re4 15.Be3 Kh7 16.Rf1 Kg8 17.Qh6 b3 18.Rxb3 Qxd6 19.Rb5 Qd3 20.Rxh5 Qxf1+ 21.Kh2
White is clearly better: +/- (74% +59% =30% -11%) Depth: 30/78 01:08:18 48087kN, tb=234

A Stockfish-dev search from the root position currently has Qe4 Rd2 Bxe6 at +2.90. Unfortunately, it also has Bxe6 at the end of the movelist. Seems like poor move ordering for such a "tactical" position:

info depth 66 currmove a2e6 currmovenumber 46
info depth 66 seldepth 100 multipv 1 score cp 290 nodes 115177903170 nps 37750560 hashfull 1000 tbhits 0 time 3051025 pv e3e4 c2d2 a2e6 d6e5 a3e7 d8d4 e4d4 d2d4 e6a2 a5c6 f1b1 b6b5 a4b5 a6b5 b1c1 c6b8 c1c8 b8d7 a2b3 d7f6 a1a6 f6e4 a6a8 e4d6 e7d6 d4d6 c8e8 f8e8 a8e8 g8g7 e8e5 h7h5 e5b5 d6d7 g1f2 f7f6 b3d5 g7h6 f2f3 d7c7 f3e4 h6g5 h2h3 c7d7 e4f3 f6f5 f3e3 h5h4 e3f3 d7d6 b5a5 d6d7 a5c5 d7d8 d5c4 d8d6 f3e3 d6b6 c4d5 b6d6 c5a5 d6d7 a5b5 d7d8 d5c4 d8e8 e3f2 e8c8 c4e2 c8c3 b5b6 g5h6 e2f3 h6g7 b6b4 g6g5 b4b6 c3c4 b6c6 c4b4 f3h5 b4b2 f2g1 b2b5 c6a6 b5c5

[mmt]

I think Qe4 and Bb3 are also winning, so it's not great as a test position. Still, it's a nice move.

[yurikvelo]

Bxe6 seems clearly best:

Among couple of winning moves - it's a matter of horizon effect, in some PV fail-high can happer a bit earlier, in some PV a bit later, so root node is unstable.

After deepening both lines (~D=40 per move) to move #18 we get similar positions with BvsP
and D=40 analysis for #19

1. Bxe6 Qa8 line
+4,51 19.Rb3 Rc7 20.Rd3 Kf7 21.Rd5 Rb7

1. Bb3 Nxb3 line
+5,06 18.Rb1 Kg6 19.Kf2 h5 20.Rb8 Kf5

mostly identical BvsP positions with SLIGHTLY better horizon effect for 1. Bb3 Nxb3 line

For human player, both BvsP positions are identically difficult to realize Bishop advantage and both require accurate (GM level) shuffling rook and king for a long time. In engines self-play (D=40+ per move, TB7 lomonosov in 7-piece position) Bxe6 mates black faster

[pgn][SetUp "1"]
[FEN "3qnrk1/5p1p/pp1ppPp1/n3P3/P7/B3Q3/B1r3PP/R4RK1 w - - 0 1"]
[PlyCount "111"]


1. Bxe6 (1. Bb3 Nxb3 2. Qxb3 Qc7 3. Rac1 Rxc1 4. Rxc1 Qd7 5. Qb4 b5 6. axb5
axb5 7. Qd4 b4 8. Bxb4 Qb5 9. Ba3 Qa5 10. Ra1 h6 11. h3 Qd5 12. Qxd5 exd5
13. Bb4 Kh7 14. Rf1 g5 15. exd6 Nxd6 16. Bxd6 Ra8 17. Be7 Ra5 18. Rb1 Kg6
19. Kf2 h5 20. Rb8 Kf5 21. Rf8 Ke6 22. Rh8 h4 23. Kf3 Ra4 24. Rg8 Rf4+ 25.
Ke3 Rf5 26. Kd3 Ke5 27. Bd8 Ke6 28. Bb6 Kxf6 29. Bd8+ Ke6 30. Bxg5 Kd6 31.
Bxh4 Ke6 32. Bg5 Rf2 33. Be3 Rf1 34. Ke2 Rh1 35. Rg4 Ra1 36. h4 Rh1 37. Rd4
Rh2 38. Kf3 Rh1 39. Bf2 Kd6 40. Ke2 Ra1 41. h5 Ra8 42. Rf4 Re8+ 43. Kf3 Rh8
44. g4 Rb8 45. h6 Rh8 46. Bd4 Rxh6 47. Rf6+ Rxf6+ 48. Bxf6 Kc5 49. Kf4 d4
50. Ke5 d3 51. Bg5 Kc6 52. Kf6 Kd7 53. Kxf7 Kd6 54. Bd2 Kc5 55. g5 Kc4 56.
g6 Kb3 57. Ba5 Kc2 58. Kf6 d2 59. Bxd2 Kxd2 60. Ke5 Kc1 61. g7 Kd2 62. Ke4
Kc3 63. g8=Q Kb4 64. Kd4 Kb5 65. Qg6 Ka4 66. Qb6 Ka3 67. Kc3 Ka2 68. Qb2#)
1. .. Qa8 (1. .. fxe6 2. f7+ Rxf7 3. Rxf7 Kxf7 4. Rf1+ Kg8 5. exd6 Nf6 6.
Qxe6+ Kg7 7. Bc1 h6 8. g3 g5 9. h4 Rxc1 10. Rxc1 Ne8 11. Rf1 Nxd6 12. h5
Qe8 13. Qxd6 Nc6 14. Qf6+ Kh7 15. Qf7+ Qxf7 16. Rxf7+ Kg8 17. Rf6 Ne5 18.
Rxb6 a5 19. Rxh6 Kg7 20. Re6 Nf3+ 21. Kg2 g4 22. Ra6 Ne1+ 23. Kg1 Nf3+ 24.
Kf2 Ne5 25. Rxa5 Nd3+ 26. Kg1 Nc1 27. Rb5 Kh6 28. Rb6+ Kg7 29. a5 Ne2+ 30.
Kf2 Nc1 31. a6 Nd3+ 32. Kg1 Ne5 33. a7 Nd7 34. Rg6+ Kf8 35. a8=Q+ Ke7 36.
Qc6 Ne5 37. Qd6+ Ke8 38. Re6+ Kf7 39. Re7+ Kg8 40. Qb8#) 2. Qh3 Qe4 3. Rae1
Qd4+ 4. Kh1 Rf2 5. exd6 Nxf6 6. d7 Ne4 7. Rg1 Nc5 8. Bg4 Nc6 9. Re8 Nxd7
10. Bxd7 Rxe8 11. Bxe8 Nb4 12. Qh6 Qf4 13. Bxf7+ Qxf7 14. Bxb4 Qf4 15. Qxf4
Rxf4 16. Rb1 Rc4 17. h3 b5 18. axb5 axb5 19. Rb3 Rc7 20. Rd3 Rc4 21. Bd2 b4
22. Rd7 b3 23. Rb7 b2 24. Rxb2 h5 25. Rb7 h4 26. Kh2 Ra4 27. Rb6 Kh7 28.
Rb4 Ra8 29. Rxh4+ Kg8 30. Bc3 Ra6 31. Rb4 Ra3 32. Bb2 Ra5 33. Rb6 Kf7 34.
Rf6+ Ke7 35. Rxg6 Rb5 36. Bc1 Kf7 37. Rc6 Ra5 38. g4 Ke7 39. g5 Ra2+ 40.
Kg3 Kd7 41. Rc3 Re2 42. h4 Re1 43. h5 Rg1+ 44. Kh2 Rf1 45. g6 Rf2+ 46. Kh3
Rf1 47. g7 Rg1 48. h6 Kd6 49. h7 Ke5 50. h8=Q Rh1+ 51. Kg2 Rxh8 52. gxh8=Q+
Ke6 53. Bb2 Kd6 54. Qe8 Kd5 55. Qc6+ Ke5 56. Rf3# 1-0

[/pgn]

After 1. ... fxe6 - black King is mated by #40