Here is an interesting tesuji which just came up in one of my games. I would expect any dan player to see it but kyu players may miss it. It is the endgame with only small points left and it is white to play. The obvious move is a but that is not what I played. Given the clue most kyu players will also find it, but how many would do so in a game?

Click Here To Show Diagram Code

[go]W to play
$$ . . . . . . X . . . |
$$ . . . . . . X . . . |
$$ . . . . . . X . . . |
$$ . . . . . O O X . X |
$$ . . . . . O X X a . |
$$ . . . . . O O . O O |
$$ . . . . . . . O O X |
$$ . . . . . O O X X X |
$$ . . . . . X X O . O |
$$ . . . . . . X X O . |
$$ . . . . . . . X X O |
$$ . . . . . . . O O O |
$$ . . . . . . . . . . |[/go]

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Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

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KGS 4 kyu - Game Archive - Keyboard Otaku

I would have missed it. Thanks for sharing an interesting position.