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| − | A peep (term borrowed from Go) is a forcing move to which opponent has to answer locally to defend against an immediate threat. This situation occurs if one threatens to cut a connection between major groups or key stones of opponent's. The stone causing this threat is called a peep. | + | A move is forcing when opponent has to answer locally to hold their advantage in a key area of the board. |
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| − | Sometimes it's hard to tell if a move is forcing, i.e. if the peep is correct or wrong. Playing correct peeps is one of the most sophisticated aspects of hex strategy.
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| − | == Example ==
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| − | <hexboard size="6x6"
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| − | coords="show"
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| − | contents="R :d3 B :e4 R :e3 B :b3 R :b4 E *:c4 E *:c3"
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| − | /><br/>
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| − | In this position blue player can play 2 correct peeps - c4 or c3. In case of playing c3, red has to defend with c4. In case of playing c4, red has to defend with c3. Otherwise red loses the game.
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| − | Notice that moves on a4, a5, f2 and f3 are wrong peeps. Against a4, a5 red has a choice of playing b5 which improves their position. Similarly, against f2, f3 red should play d2.
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| − | == Crucial peep ==
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| − | There is a great use for playing peeps. In certain conditions a player can benefit from them and claim victory. Look at the following example:
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| − | <hexboard size="9x9"
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| − | coords="show"
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| − | contents="R :h4 B :d4 R :e5 B :g6 R :c6 E *:d6 E *:g4"
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| − | /><br/>
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| − | The only winning move for blue is the peep on d6. If blue misses it the game proceeds as follows and the winner is red.
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| − | <hexboard size="9x9"
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| − | coords="show"
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| − | contents="R :h4 B :d4 R :e5 B :g6 R :c6 B 1:g4 R 2:g5 B 3:f5 R 4:f6 B 5:e6 R 6:d8 B 7:e7 R 8:e9"
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| − | /><br/>
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| − | If d6 is played then blue win.
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| − | <hexboard size="9x9"
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| − | coords="show"
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| − | contents="R :h4 B :d4 R :e5 B :g6 R :c6 B 1:d6 R 2:d5 B 3:g4"
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| − | /><br/>
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Revision as of 15:52, 22 February 2017
A move is forcing when opponent has to answer locally to hold their advantage in a key area of the board.
