|May-20-19|| ||LoveThatJoker: 18. QxB+, followed by 19. N-K4+.|
|May-20-19|| ||agb2002: The defenseless black queen and the knight near Black's royal family lead to 18.Qxd6+ Kxd6 19.Ne4+ and 20.Nxc3, winning a piece.|
|May-20-19|| ||saturn2: 18. Qxd6+ and if black retakes or not he will be down a piece. Maybe it is better to leave the queens on the board.|
|May-20-19|| ||Cheapo by the Dozen: The old "Temporary queen sac, then recovery via fork" trick.|
|May-20-19|| ||lost in space: 18. Qxd6+ Kxd6 (else: piece down) 19. Ne4+ K(any legal move) 20. Nxc3 and white is a piece up, enough to win|
|May-20-19|| ||Rumor: At first glance, hard to understand how black could walk into that in a correspondence game, but in fact, the silicon monster confirms that he already had a wholly lost position after 9...Qa5.|
|May-20-19|| ||Willber G: Wohlhaupt walloped!|
|May-20-19|| ||whiteshark: I love Mondays! This time nothing to add.|
|May-20-19|| ||Lorenzo69: How about 18. Ne4 before 19. Qxd6+ to keep the Q, still 1 piece up, albeit a minor one?|
|May-20-19|| ||Willber G: <Lorenzo69: How about 18. Ne4 before 19. Qxd6+ to keep the Q, still 1 piece up, albeit a minor one?>|
|May-20-19|| ||zb2cr: 18. Qxd6+ wins a piece. If Black retakes ... Kxd6, White remains a piece up with the fork 19. Ne4+.|
|May-20-19|| ||patzer2: Black's poor development is quickly and decisively punished in this game.|
The problem IMO start with the novelty 5...c6? which neglects development, blocks the Queen Knight's access to it's strongest square, and potentially allows 6. e5 ±.
Instead, the computer pick 5...Nxe5 6. Nxe5 d4 ∓ is probably better, even though it has favored White in practice. A more practical alternative is 5...Nc6 = which, according to our Opening Explorer, has strongly favored Black in OTB play.
Black's lack of development gives White a won game after 9...Qa5?? 10. Bxf4 +- (+5.57 @ 27 ply, Stockfish 10). Instead, 9...Nd7 10. Bxf4 ⩲ or 9...0-0 10. Bxf4 ⩲ would have given the second player a fighting chance.
|May-20-19|| ||TheaN: <saturn2: Maybe it is better to leave the queens on the board.> How exactly?|
19.Qxd6+ Kb6 (Kc8 20.Ne6 +- is terrible, Kb7 20.Qxd7 +- is at least two pieces down) 20.Ne6 and White keeps Nd7 en prise as well as threatening Qc7+. As the Knight's defending c5, I guess Black could try only moving a rook to d8, but after 21.Qc7+ with 22.Nxd8 +- Black's almost out of any pieces. Sure, 19....Kxd6 is just stay of execution so I don't get why Black didn't resign after 19.Qxd6+.
|May-20-19|| ||TheaN: In fact already after 18.Qe6 SF9 gives:
1) +4.12 (23 ply) 17...Kc7 18.Qxd6+ Kxd6 19.Ne4+ Kc7 20.Nxc3
So Black doesn't really have any alternatives except running into this.
|May-20-19|| ||gawain: After 18 Qxd6+ Black could have resigned and saved the cost of a few postage stamps.|
|May-20-19|| ||beenthere240: It took black a while to realize he was down a piece.|
|May-20-19|| ||TheaN: <patzer2: Instead, the computer pick 5...Nxe5 6. Nxe5 d4 ∓ is probably better, even though it has favored White in practice.>|
Assuming you mean the reversed 5....Nxe4 with d5: I guess it allows White to spin up the guns on the f-file with 6.Bxf7+!? Kxf7 7.Nxe4. It's better for Black but quite tricky (best seems to be immediately 7....Rf8! with the idea to shield the King in an artificial castle).
|May-20-19|| ||zb2cr: The tentative suggestion by <saturn2> about leaving Queens on the board runs into a buzz saw. Black has 4 alternatives to taking the White Queen:
... Kd8, ... Kc8, ... Kb7, and ... Kb6.
A. 18. ... Kd8 runs right into forced mate. 19. Ne6+, Kc8; 20. Qc7#.
B. 18. ... Kc8; 19. Ne6 threatening mate at c7.
B.1. 19. ... Qe3+; 20. Kh1, Qxe6; 21. Bxe6 is clearly fatuous.
B.2. 19. ... Qa5; 20. Qxc6+, Kb8; 21. Qxd7, Qb6; 22. Nc7, Qxc7; 23. Qxb5+, Qb7; 24. Qe5+, Qc7; 25. Rb1+, Kc8; 26. Be6+, Kd8; 27. Qd5+, Ke7 ( 27. ... . Ke8 loses both Black Rooks.); 28. Rbe1 and Black is helpless.
C. 18. ... Kb7; 19. Qxd7+.
C.1. 19. ... Kb8; 20. Bg8, Rxg8; 21. Rf7 forces mate along White's 7th rank.
C.2. 19. ... Kb6; 20. Ne6, Rhc8; 21. Rf2 and it looks as though WHite has to be satisfied with "only" a two-piece edge.
D. 18. ... Kb6; 19. Qxd7 looks like a transposition to line C.2.
|May-21-19|| ||patzer2: <TheaN> Thanks! I did mean 5...Nxe4 6. Nxe4 d5 ∓, which as you note is probably better but is also tricky and difficult. Its poor results in OTB board play confirm your assessment.|