Difference between revisions of "Common mistakes"

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== Ladder Escaping Too Early ==
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== Ladder escaping too early ==
  
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<hex>R6, C10, Q1, Vc6, Ve5, Vg4, Vg3, Vg2, Hd4, Hf3, Hg1, Hh1, Hh3, Hi2, Hb2</hex>
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<hex>R6, C10, Q1, Vc6, Ve5, Vg4, Vg3, Vg2, Hd4, Hf3, Hg1, Hh1, Hh3, Hi2, Hb2, Ha6</hex>
  
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Red to move. In this situation Red has a win with perfect play. He only has to find a good [[Ladder escape|ladder escape]] from the [[Ladder|ladder]] starting at h1, g2. c2 is such an escape. However, playing c2 in this stage of the game is a losing move because Blue can play any of f1, f2, e2. Another good escape from the [[Second row|second line]] would be c3, but once again it fails it this situation. So what should Red do? The only way to win is to play out the ladder to e2 and ''then'' jump to c2:
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Red to move. In this situation Red has a win with perfect play. He only has to find a good [[Ladder escape|ladder escape]] from the [[Ladder|ladder]] starting at h1, g2. c2 is such an escape.
  
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<hex>R6, C10, Q1, Vc6, Ve5, Vg4, Vg3, Vg2, Hd4, Hf3, Hg1, Hh1, Hh3, Hi2, Hb2, He1, Hf1, Vf2, Ve2, Vc2</hex>
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=== Wrong variations ===
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However, playing c2 in this stage of the game is a losing move because Blue can play f2 or e2. (Previously this page stated Blue could play f1, too. But Red could answer c3, threatening both b5 and e3.)
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<hex>R6 C10 Q1
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                  Hg1 Hh1
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Hb2 V1c2      Se2 Sf2 Vg2 Hi2
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                  Hf3  Vg3 Hh3
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          Hd4           Vg4
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                Ve5
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        Vc6 Ha6
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</hex>
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Another good escape from the [[second row]] would be c3, but it fails too:
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<hex>R6 C10 Q1
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                  Hg1 Hh1  
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Hb2 V1c3      H2e2 Vg2 Hi2  
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                  Hf3  Vg3 Hh3
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          Hd4          Vg4
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                Ve5
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        Vc6 Ha6
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</hex>
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=== Right variation ===
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So what should Red do? The only way to win is to play out the ladder to e2 and ''then'' jump to c2:
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<hex>R6 C10 Q1
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            H4e1 H2f1 Hg1 Hh1
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Hb2 V5c2    V3e2 V1f2 Vg2 Hi2
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                  Hf3  Vg3 Hh3
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          Hd4          Vg4
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                Ve5
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        Vc6 Ha6
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</hex>
  
 
Now Blue cannot block Red's connection. A further development game could be: d2, c3, d3, b5 and Red makes a double [[Bridge|bridge]], connecting c3 and c6.
 
Now Blue cannot block Red's connection. A further development game could be: d2, c3, d3, b5 and Red makes a double [[Bridge|bridge]], connecting c3 and c6.
  
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== Bad Bridge Intrusion ==
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== Bad [[bridge intrusion]] ==
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<hex>R6, C10, Q1, Vc6, Ve5, Vg4, Vg3, Vg2, Hd4, Hf3, Hg1, Hh1, Hh3, Hi2, Hb2, Ha6</hex>
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The same situation can be lost if Red intrudes into the d4-f3 bridge at e3. Of course if Blue doesn't see the trap he will fill up the bridge at e4 and then Red's e3 is a ladder escape. But Blue can play f2 and win because the ladder moved from second to the [[third row]], and Red has no ladder escape from the third row.
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''Remember that such a bridge intrusion removes the ladder one row further from the edge, which is often a disadvantage to the attacking player.''
  
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<hex>R6, C10, Q1, Vc6, Ve5, Vg4, Vg3, Vg2, Hd4, Hf3, Hg1, Hh1, Hh3, Hi2, Hb2</hex>
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<hex>R6 C10 Q1
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                    Hg1 Hh1
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Hb2         H4e2 H2f2 Vg2 Hi2
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            V1e3 Hf3  Vg3 Hh3
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          Hd4 V3e4 Vg4
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              Ve5
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      Vc6 Ha6
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</hex>
  
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The same situation can be lost if Red intrudes into the d4-f3 bridge at e3. Of course if Blue doesn't see the trap he will fill up the bridge at e4 and then Red's e3 is a ladder escape. But Blue can play f2 and win because the ladder moved from second to the [[Third row|third line]], and Red has no ladder escape from the third line.
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[[category:strategy]]
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''Remember that such a bridge intrusion removes the ladder one line further from the edge, which is often a disadvantage to the attacking player.''
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Latest revision as of 03:58, 18 December 2020

Ladder escaping too early

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Red to move. In this situation Red has a win with perfect play. He only has to find a good ladder escape from the ladder starting at h1, g2. c2 is such an escape.

Wrong variations

However, playing c2 in this stage of the game is a losing move because Blue can play f2 or e2. (Previously this page stated Blue could play f1, too. But Red could answer c3, threatening both b5 and e3.)

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Another good escape from the second row would be c3, but it fails too:


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Right variation

So what should Red do? The only way to win is to play out the ladder to e2 and then jump to c2:

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Now Blue cannot block Red's connection. A further development game could be: d2, c3, d3, b5 and Red makes a double bridge, connecting c3 and c6.

Bad bridge intrusion

abcdefghij123456

The same situation can be lost if Red intrudes into the d4-f3 bridge at e3. Of course if Blue doesn't see the trap he will fill up the bridge at e4 and then Red's e3 is a ladder escape. But Blue can play f2 and win because the ladder moved from second to the third row, and Red has no ladder escape from the third row. Remember that such a bridge intrusion removes the ladder one row further from the edge, which is often a disadvantage to the attacking player.

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