The full game can be seen at S4 but here I will concentrate on what I should have played instead of blundering a pawn on move five.
The game began as a Colle, 1d4 d5 2.Nf3 Nc6 3.e3, which I combatted with the Chigorin-style 3...Bg4, one idea of which is to play for a quick ...e5.
White countered with 4.Bb5, to which I replied with the main move in ChessBase's 2022 Mega database, 4...e6.
The continuation 5.c4 first appears in Mega22 as recently as 1996.
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| How should Black respond? |
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The position resembles a mainline Chigorin with Nf3, except the white light-square bishop has been developed outside of the pawn chain.
I played 5...a6?, losing a pawn to 6.Bxc6+ bxc6 7.Qa4 Ne7 8.Ne5 Bh5 9.Nc3 (not 9.Nxc6?? Qd7) f6 10.Nxc6.
The most popular continuation in Mega22 is 5...Bb4+ 6.Bd2 Bxd2+ 7.Nbxd2 Ne7, reaching a position Stockfish15 and Komodo13.02 reckon favours White. One line given by them runs 8.cxd5 exd5 9.Qb3!? (probably a novelty) Rb8 10.h3, when the engines agree White has a slight edge.
They instead recommend 5...Qd7!?, when Nenad Sulava (2466) - Igor Miladinović (2501), Ano Liosia (Athens) 1999, saw 6.exd5 Qxd5?! 7.Qa4?! Bxf3 8.Nc3!? Bd1! 9.Kxd1?! Qxg2 10.d5?? Qxh1+ (0-1, 26 moves). Many probable improvements are available on this play, starting as early as move six. Miladinović is a Chigorin specialist, but the more-normal Chigorin move 6...exd5 is the way to go, according to the engines. They continue 7.h3 Bxf3!? 8.Qxf3 f5!? 9.Nc3 Nf6 10.Bd2 Bb4!? 11.a3 Bxc3 12.Bx3 0-0 13.0-0 Ne4, when the white bishop-pair is a negligible factor. Stockfish15 gives White a slight edge, but Komodo13.02 at first reckons the position is equal, although it comes to more-or-less agree with Stockfish15.
CONCLUSION: almost anything is better than the game's 5...a6?, but moves such as 5...Qd7!? and 7...Bxf3!? are somewhat counter-intuitive, so it is probably fair to say White's position is easier to play.
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