quarta-feira, 4 de setembro de 2013

Forcing Moves

Captado no blog http://tacticstime.com/
A deep study is forcing moves is probably the single most important task toward achieving chess mastery ~ Charles Hertan

tactics position 196
his game was played on gameknot.com and was posted on reddit.com under the title "Must admit, I was proud of this trap and the subsequent mate (I'm white)", which you can read here: http://redd.it/wzhgy
In the position on the right it is White to move.
Answer below.
This game shows some good examples of "forcing moves". White missed a forcing move early in the game, but won on a completely non forcing move later in the game, when his opponent missed a threat, and grabbed a piece that appeared to be "free".
From the excellent chess book "Forcing Moves" by Charles Hertan:
"A forcing move is a move which limits the opponent's options. Nothing more or less. Many players think only of checks, captures or flashy sacrifices when they hear this term. While checks and captures do tend to be forcing, frequently the are far from the most forcing choices."
"The first step towards developing better calculation skills is to train yourself to always analyze the most forcing moves first. This is not always because they are the best! The most forcing move may lose outright, and usually does! There are three compelling reasons why analyzing forcing moves first is necessary:
1. Forcing moves have the potential to transform the game, by leading to gains of material, checkmate or other concrete gains. When they do work, they tend to work better and quicker than non forcing options.
2. Analyzing the most forcing moves saves precious time. If they work, there is no need to look any further! Countless winning positions have been squandered by players who wasted huge amounts of time examining obscure ideas, when a clearly decisive forcing move was available.
3. Forcing moves limit the opponent's options, and thereby reduce the risk of a calculation error. Fewer replies to calculate means less chance of slipping up, so all things being equal, the most forcing option is simplest and best."
Here is the complete game:
[Event "http://gameknot.com/chess.pl?b"]
[Site "http://gameknot.com/chess.pl?b"]
[Date "2012.07.22"]
[Round "?"]
[White "ruhurt"]
[Black "h_e_m_m_e"]
[Result "1-0"]
[ECO "C70"]
[WhiteElo "1408"]
[BlackElo "1371"]
[PlyCount "41"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5 5. Bb3 h6 6. c3 Nf6 7. O-O Na5 8. d4
Nxb3 9. Qxb3 Nxe4 10. Nxe5 d5 11. Re1 Be7 12. Nd2 Be6 13. Nxe4 O-O 14. Ng3 Qd6
15. Bf4 g5 16. Bd2 Kg7 17. Nh5+ Kh8 18. Qc2 Rg8 19. Re3 c5 20. Rh3 Bxh3 21.
Nxf7# 1-0

You can play through this game here: http://tacticstime.com/ruhurt-vs-h_e_m_m_e/

In the game White missed 12. Rxe4! which would win a piece. If black recaptures with 12...dxe4 they would be mated with 13. Qxf7#
White sets a cute trap at the end, with a nice checkmate as well that is worth checking out.
Happy Tactics!
Your Friend,


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