Difference between revisions of "Common mistakes"
(+1 diagram + move numbered) |
(Added a blue stone at a6, removed f1 from the refutations against 1.c2, added a diagram for 1.c3) |
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== Ladder escaping too early == | == Ladder escaping too early == | ||
| − | <hex>R6, C10, Q1, Vc6, Ve5, Vg4, Vg3, Vg2, Hd4, Hf3, Hg1, Hh1, Hh3, Hi2, Hb2</hex> | + | <hex>R6, C10, Q1, Vc6, Ve5, Vg4, Vg3, Vg2, Hd4, Hf3, Hg1, Hh1, Hh3, Hi2, Hb2, Ha6</hex> |
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. | 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. | ||
| − | === Wrong | + | === Wrong variations === |
| − | However, playing c2 in this stage of the game is a losing move because Blue can play | + | 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). |
<hex>R6 C10 Q1 | <hex>R6 C10 Q1 | ||
| − | + | Hg1 Hh1 | |
Hb2 V1c2 Se2 Sf2 Vg2 Hi2 | Hb2 V1c2 Se2 Sf2 Vg2 Hi2 | ||
Hf3 Vg3 Hh3 | Hf3 Vg3 Hh3 | ||
Hd4 Vg4 | Hd4 Vg4 | ||
Ve5 | Ve5 | ||
| − | Vc6 | + | Vc6 Ha6 |
| + | </hex> | ||
| + | |||
| + | Another good escape from the [[Second row|second line]] would be c3, but it fails too: | ||
| + | |||
| + | |||
| + | <hex>R6 C10 Q1 | ||
| + | Hg1 Hh1 | ||
| + | Hb2 V1c3 H2e2 Vg2 Hi2 | ||
| + | Hf3 Vg3 Hh3 | ||
| + | Hd4 Vg4 | ||
| + | Ve5 | ||
| + | Vc6 Ha6 | ||
</hex> | </hex> | ||
| Line 27: | Line 39: | ||
Hd4 Vg4 | Hd4 Vg4 | ||
Ve5 | Ve5 | ||
| − | Vc6 | + | Vc6 Ha6 |
</hex> | </hex> | ||
| Line 34: | Line 46: | ||
== Bad [[bridge intrusion]] == | == Bad [[bridge intrusion]] == | ||
| − | <hex>R6, C10, Q1, Vc6, Ve5, Vg4, Vg3, Vg2, Hd4, Hf3, Hg1, Hh1, Hh3, Hi2, Hb2</hex> | + | <hex>R6, C10, Q1, Vc6, Ve5, Vg4, Vg3, Vg2, Hd4, Hf3, Hg1, Hh1, Hh3, Hi2, Hb2, Ha6</hex> |
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. | 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. | ||
| Line 45: | Line 57: | ||
Hd4 V3e4 Vg4 | Hd4 V3e4 Vg4 | ||
Ve5 | Ve5 | ||
| − | Vc6 | + | Vc6 Ha6 |
</hex> | </hex> | ||
[[category:strategy]] | [[category:strategy]] | ||
Revision as of 08:36, 6 August 2016
Contents
Ladder escaping too early
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).
Another good escape from the second line would be c3, but it fails too:
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:
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
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 line, and Red has no ladder escape from the third line. Remember that such a bridge intrusion removes the ladder one line further from the edge, which is often a disadvantage to the attacking player.
