Nick gave us this wickedly hard under the stones problem. I showed it to a 4 dan player and he had quite a few attempts to get it! Here it is, Black to force a ko for the life of the white stones:
On Sunday we had the handicap tournament, where, I think, the draw is conducted basically at random and stone and time handicaps are applied. I had to play a two stronger players and two weaker players. I won only one game. Two I lost due to silly mistakes (failing to make two eyes just before filling dame, and failing to see an oiotoishi) - other than that I had a clear lead in both games. The other game I lost I had to give six stones to a player that I don't think is that much weaker than me! I'm glad to say that in a more recent game I did spot the oiotoishi and was rather smug in doing so.
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