Engine-assisted game vs Stockfish, move 23 discussion

MooMoo2 · 2017-02-02, 05:09

The most popular move on the move 22 poll was ...Bxd5. Stockfish played 23. Qxd5, and the FEN is:
2rq1r1k/7p/2np4/1p1Qbp2/4pP2/2P5/1PN1B1PP/R4RK1 b - - 0 23

Game so far: 1.e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Ndb5 d6 7. Bf4 e5 8. Bg5 a6 9. Na3 b5 10. Bxf6 gxf6 11. Nd5 f5 12. c3 Bg7 13. Bd3 Be6 14. Nc2 O-O 15. O-O fxe4 16. Bxe4 Rc8 17. a4 f5 18. axb5 axb5 19. Bf3 e4 20. Be2 Kh8 21. Qd2 Be5 22. f4 Bxd5 23. Qxd5

Depth: 57 ply. Nodes searched: 917,798,447,531 (~918 G)

gd_barnes · 2017-02-02, 06:28

23...Qb6+ is clearly the strongest move suggested by Komodo here.

From here it goes: 24. Kh1 Bg7.

At move 25, white has multiple choices so we will analyze more when it makes its 25th move.

LaurV · 2017-02-02, 14:44

Interesting, Rybka says that SF went for a draw with 21.Qd2, where better moves may had been available.... which is a bit my feeling too... The evaluation after 21 Qd2 and 22 f4 is a big fat zero... (edit, yes, for 23...Qb6, other moves have over half pawn score against)

gd_barnes · 2017-02-02, 20:38

Quote:

Originally Posted by LaurV

Interesting, Rybka says that SF went for a draw with 21.Qd2, where better moves may had been available.... which is a bit my feeling too... The evaluation after 21 Qd2 and 22 f4 is a big fat zero... (edit, yes, for 23...Qb6, other moves have over half pawn score against)

Komodo showed that 21. Qd2 was the best move there and other moves may have been worse for it. Strange. The key now will be white's 25th move. There are multiple possibilities. I don't want to even discuss it here until it makes its move because MooMoo and SF may get some hints. lol

MooMoo2 · 2017-02-03, 03:33

Quote:

Originally Posted by gd_barnes

The key now will be white's 25th move. There are multiple possibilities. I don't want to even discuss it here until it makes its move because MooMoo and SF may get some hints. lol

Expect to see a high search depth on move 25

gd_barnes · 2017-02-03, 09:16

I am favor of an if-then move here. 23...Qb6+ if 24. Kh1 then Bg7.

Komodo sees both white and black's 24th move as about a half pawn better than any other move so I think this is a reasonable spot for an if-then move.

I will leave town in a little under two weeks. I'd like a lot of time to look at our response to white's 25th move next week.

2017-02-02, 05:09	#1
MooMoo2 "Michael Kwok" Mar 2006 2²×5×59 Posts	Engine-assisted game vs Stockfish, move 23 discussion The most popular move on the move 22 poll was ...Bxd5. Stockfish played 23. Qxd5, and the FEN is: 2rq1r1k/7p/2np4/1p1Qbp2/4pP2/2P5/1PN1B1PP/R4RK1 b - - 0 23 Game so far: 1.e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Ndb5 d6 7. Bf4 e5 8. Bg5 a6 9. Na3 b5 10. Bxf6 gxf6 11. Nd5 f5 12. c3 Bg7 13. Bd3 Be6 14. Nc2 O-O 15. O-O fxe4 16. Bxe4 Rc8 17. a4 f5 18. axb5 axb5 19. Bf3 e4 20. Be2 Kh8 21. Qd2 Be5 22. f4 Bxd5 23. Qxd5 Depth: 57 ply. Nodes searched: 917,798,447,531 (~918 G) Attached Thumbnails

2017-02-02, 14:44	#3
LaurV Romulan Interpreter "name field" Jun 2011 Thailand 41×251 Posts	Interesting, Rybka says that SF went for a draw with 21.Qd2, where better moves may had been available.... which is a bit my feeling too... The evaluation after 21 Qd2 and 22 f4 is a big fat zero... (edit, yes, for 23...Qb6, other moves have over half pawn score against) Last fiddled with by LaurV on 2017-02-02 at 14:47

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2017-02-02, 06:28	#2
gd_barnes "Gary" May 2007 Overland Park, KS 5×2,459 Posts	23...Qb6+ is clearly the strongest move suggested by Komodo here. From here it goes: 24. Kh1 Bg7. At move 25, white has multiple choices so we will analyze more when it makes its 25th move.

2017-02-03, 09:16	#6
gd_barnes "Gary" May 2007 Overland Park, KS 5·2,459 Posts	I am favor of an if-then move here. 23...Qb6+ if 24. Kh1 then Bg7. Komodo sees both white and black's 24th move as about a half pawn better than any other move so I think this is a reasonable spot for an if-then move. I will leave town in a little under two weeks. I'd like a lot of time to look at our response to white's 25th move next week.