Round 6:
Jonah Busch (Kondsaga) (1711) - Ahyan Zaman (ahyanzaman) (1496) [E11]
Live Chess Chess.com, 18.08.2020
[de Firmian,Nick]
1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Nbd2 [4.Bd2] 4...d5 Old-style. [4...0-0 keeps options: 5.a3 Be7 6.e4 d5 (6...d6!? rather asks the N/d2, what are you doing there...) 7.e5 Nfd7 8.Bd3 c5 9.h4!? was a fun line until it was clarified that 9...g6! was the way to defend. (The "fun" happens after 9...cxd4?? 10.Bxh7+!) ; Or there's 4...b6 "committing" to the Queen's Indian.] 5.a3 [5.Qa4+] 5...Bxd2+?! This is probably White's "as good as it gets" against the Bogo-Indian. Two bishops, Black's unsolved bad LSB. [5...Be7 is almost always played.] 6.Nxd2!? [6.Bxd2 is 7 or 8 times as common -- but the text move scores better. And it makes sense, to contest e4 (guarding c4 is almost incidental).] 6...0-0 7.g3?!
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[7.e3 is more common by a lot, if more sensible, first played at least as early as 1931! 7...b6 8.cxd5 exd5 9.Bd3 Nbd7 10.b3 c5 11.Bb2 1-0 (29) Zamikhovsky,A-Rosenkrantz,K Moscow 1931] 7...dxc4!? Looks good, since White can't take back (... Qd5...). [But 7...Nc6! 8.e3 e5 highlights the problem. Black busts open the center and puts White on the spot. 9.Bg2 exd4 10.cxd5 dxe3 11.fxe3 Nxd5] 8.Bg2 Qxd4 9.0-0 Rd8 [9...Nc6! 10.Qc2 (10.Bxc6?! bxc6 when White will miss his king bishop even more than Black was.) 10...Na5 gets annoying.] 10.e3 [10.Qc2 wins back one pawn with sufficient compensation for the other (Black's queen gets kicked around more than she'd like).] 10...Qd3 Clear plus Black now. 11.Qa4 c3 [11...Bd7!? 12.Qxc4 Bc6 Who's your bad bishop now?] 12.bxc3 Qxc3?! [12...Bd7 here also] 13.Rb1 c6 [13...Nd5] 14.Ne4 [14.Bb2! Some queen-kicking coming.] 14...Nxe4 15.Bxe4 f5 [Not a lot of humans find 15...Re8! thinking about dulling the long diagonal with ...e5 at some point.] 16.Bb2 Qc5 17.Bc2 Rd2?! Black needed to be thinking development, defense. [17...Nd7 18.Rfd1 Re8] 18.Rfc1 [18.Bb3! thwarts.] 18...Rd7
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Black's position would be pathetic if he didn't have two pawns to show for it; but maybe that's not enough. 19.Bb3 Qe7 20.Qf4 threatens f5 [20.Qc4!] 20...Qf7 21.Qe5?! [21.e4! fxe4 22.Qxe4 Rd8 23.Re1 Is this a Bogo-Indian -- or a Danish Gambit!?] 21...Re7 22.Rd1 Nd7 Black might consolidate now! 23.Qc3 Nf8 24.Rd6 Rd7?! Black needs a plan. [How about 24...b6! intending ...Bb7 whether or not White takes on c6.] 25.Rbd1 Rxd6 26.Rxd6 Bd7 27.Qd4 Rd8?! 28.h4 [28.Qxa7! Qe7+/= 29.Qd4?! (29.Qc5; 29.Rd2) 29...c5!= 30.Qxc5? Ba4!] 28...Qe7 29.h5 c5 3:20 remaining
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The game has become critical. [29...h6!] 30.Qe5? 6:26 remaining [30.Qxc5! Ba4? (30...h6!= has to, has to be played!) 31.Rxd8! Qxc5 32.Bxe6+ Kh8 33.h6! and White mates.] 30...Re8?? Ahyan took a good minute on this move, but it missed the danger: that Alpha pawn is zeroing in on Black's king and must be stopped! [30...h6!-/+] 31.h6! winning! 31...Qf6 [31...Ng6 when 32.Rxe6!! (32.Qxc5 is about as good, and wins prosaically) 32...Nxe5 33.Rxe7+ Kf8 34.Rxg7!+- puts some flash into it.] 32.hxg7 Qxe5 33.gxf8Q+ Kxf8 34.Bxe5 With the extra bishop (and a powerful one at that on e5) White just wins the endgame. 34...Ke7 35.Rd2 Rc8 36.Bf6+ Ke8 37.f3 c4 38.Bc2 c3 39.Rd3 [39.Rh2] 39...Bb5 40.Rxc3 Rxc3 41.Bxc3 Kd7 42.e4 fxe4 43.Bxe4 Kd6 44.Bxb7 Kc5 45.Bb4+ Kc4 46.Kf2 Kd3 47.Be4+ Kc4 48.Bxh7 Kd5 49.Be4+ Ke5 50.Ke3 Bc4 51.f4+ Kf6 52.g4 Kg7 53.Kd4 Bb5 54.Ke5 Bd7 55.Bc5 Kf7 56.Bxa7 Kg7 57.Bd4 Kf7 58.Bc2 Bc8 59.a4 Bd7 60.a5 Bc8 61.Bd3 Bb7 62.a6 Ba8 63.a7 Bd5 64.Be4 Ba8 65.Bxa8 Kg6 66.Be4+ Kf7 67.a8Q Ke7 68.Qa7+ Kf8 69.Kxe6 Ke8 70.Qe7# Kondsaga won by checkmate 1-0
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