1

Larry Christiansen has played and analysed his four games against Chessmaster.

At the 8th move, he shows a different possible continuation and says that e6 (shown below) is forced for black. I don't see why black would be any worse if another move is played, so why is this forced? For instance, is g6 not possible?

[FEN ""]
1. Nf3 c5 2. e3 Nc6 3. c4 Nf6 4. d4 d5 5. cxd5 Nxd5 6. e4 Nf6 7. d5 Nxe4 8. dxc6 Qxd1+ 9. Kxd1 Nxf2+ 10. Ke1 Nxh1 11. Bb5 b6 12. c7+ Bd7 13. Ba6 e6
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  • The only move to e6 by black is in move 13. – Aric Aug 21 '17 at 10:52
  • This continuation is not played in the game. Rather, an alternative for game's 8th move. – padawan Aug 21 '17 at 10:52
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    Christiansen uses "forced" liberally in all his videos. I wouldn't read too much into it. I think ...f6 followed by e5 is probably playable as well. – Ywapom Sep 22 '17 at 22:51
2

White has some nasty threats involving the loose a8-rook and c7 pawn. After 13...g6:

[FEN ""]
[StartPly "26"]

1. Nf3 c5 2. e3 Nc6 3. c4 Nf6 4. d4 d5 5. cxd5 Nxd5 6. e4 Nf6 7. d5 Nxe4 8. dxc6 Qxd1+ 9. Kxd1 Nxf2+ 10. Ke1 Nxh1 11. Bb5 b6 12. c7+ Bd7 13. Ba6 g6 14. Bb7 Rc8 {Saving material} 15. Bf4 {Defending the passed pawn} Bg7 {Carrying on with the planned fianchetto} 16. Bxc8 Bxc8 17. Nc3 {White will be able to take the trapped h1 knight soon or even play Ra1-d1-d8#}

However, playing 13...e6 allows the black king to attack the c7 pawn, preventing white cramping down like this.

N.B. Not checked by an engine. These are just my first impressions.

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