This is begging for a programmer to write a quick script that goes through pro games, extracts all positions in which a kosumi was played, and generates a quizz asking the user “White to play. Which kosumi was played?”
Actually, I was wondering if it would be worth a forum game…
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H4?
(yes discord that’s a complete sentence)
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Maybe the question wasn’t clear. Black played a move which forms a kosumi with one of the black stones already on the board.
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For some reason I read kosumi and understood keima 
F8
Your move makes sense but it’s not the game move.
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Does a tiger mouth count as a kosumi?
It counts, but the game move wasn’t a tiger’s mouth (although the tiger’s mouth was played a few moves later).
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I want it to be
F10
But I have no real clue or reason…
Your answer is not a kosumi. Did you have another intersection in mind?
Oops, don’t know how that happened but I am on my phone and a beer down… Edited!
LOL this game has gotten three out of three moves that are not the asked move: one misunderstanding, one variation and a typo. Ogf’s finest at work
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I’ll give the answer, it’s really not obvious.
Answer
E4
The game is here User account | Go4Go I can’t say I really understand the move. I know it’s a double peep but Black’s keima can be cut… And White did cut it just after…
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F8 and F10 have both the same problem to weaken the group on the other side, so i wont play any of them unless i feel one to be necessary or/and i know what i m doing (have a precise aim, and have an idea on how i will manage the other side)
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my view
Yes that’d nothing obvious to find.
Asking first how white will answer. If white cut through the keima, the result is still very unclear as black can reduce a lot with B9 and the cutted stone will give a lot of aji.
If white answer first at D4 then black J3 is powerful.
It would be easier if your board had coordinates.
L8 ?
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. I think the coordinates are called for too.
