Spanish Exchange
1.Nf3 Nc6 2.e4 e5 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Qxd4 7.Nxd4
 |
| The starting tabiya of the old main line of the Spanish Exchange |
AC offered a draw.
16.Rd1 h6 17.Bxf6 Bxf6 18.g3 g6 19.Nd5 Bxd5!?
Black usually keeps the bishop-pair, which is his compensation for an inferior pawn-structure. On the other hand, after the exchange on d5, Black has rook and bishop versus rook and knight, another example of an advantage even though material is supposedly equal (at least by a point-count).
20.Rxd5 b6 21.c3 Bg7
This bishop retreat was what I had expected on move 19.
22.Kd2 c6 23.Rd3 Kc7 24.b3 b5 25.c4 b4 26.Re3 Bd4 27.Rd3 Bg7 28.Kd1 a5 29.g4 a4 30.bxa4!?
I did not want to risk Black's rook invading my position after ...Ra8 and ...axb3.
30...Ra8 31.Kc2 Rxa4 32.Kb1 Ra8 33.h4?!
Almost certainly overextending on the kingside. Stockfish10 and Komodo10 give 33.f4 Re8 34.Ng3 Bd4 with a slight edge for Black.
33...Re8 34.Rd2 Bf6 35.h5 gxh5 36.gxh5 Re5 37.Ng3?
I missed that 37.Nf4 saves the h5 pawn as 37...Bg5 is met by 38.Nd3.
37...Rg5 38.Nf5 Rxh5 39.Nd6 Bc3 40.Ne8+ Kb6 41.Re2?
I rejected 41.Rd7 because of 41...Rh1+ 42.Kc2 Rh2+ 43.Kb1 (43.Kd3?? Rd2+ etc) Rb2+ 44.Kc1 Rxa2, but that is better than what should happen after the text.
41...f6?!
This may be good enough, but much stronger is 41...Rh1+ 42.Kc2 Ra1, when 43.Kd3 loses the knight to 43...Rd1+ and 44...Rd8. That leaves 43.Kb3, but then 43...Rc1 followed by …Bd4 is deadly.
42.f4 Ka5?!
Again this may be good enough, but 42...Rh1+ 43.Kc2 Ra1 44.Kd3 Rd1+ leaves Black a pawn up and with the better minor piece.
43.Ng7 Rh4 44.e5!?
This has a tricky point, but it seems better was 44.Ne6, eg 44...Kb6 45.e5 fxe5 46.fxe5 Rh5 47.Nf8 Kc7 (not 47...Rxe5?? 48.Nd7+) 48.Ne6+ Kc8 49.Nxc5 Rxe5 50.Rxe5 Bxe5 51.Nd3, when White is getting his pawn back. However, the engines reckon Black is close to winning as the bishop is much better at supporting a passed h pawn, and blocking an enemy passed a pawn, than the knight is at supporting a passed a pawn and blocking an enemy passed h pawn.
44...fxe5
Not 44...Rxf4?? 45.e6.
45.fxe5 Rxc4?
This only draws, but the engines point out 45...Ka4, when 46.e6? loses to 46...b3 47.axb3+ Kxb3 and ...Bxg7. So White has to try something such as 46.Kc2 or 46.Ne6, but in each case Black replies 46...Rxc4 and is two pawns up.
46.e6 Bf6 47.e7 Bxe7 48.Rxe7 Rh4 49.Re5 Rh1+ ½–½
No comments:
Post a Comment