In retaliation Ms Tymoshenko tried to checkmate Mr Yushchenko by teaming up with Mr Yanukovich instead.

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But it could be a long and complex one, since the politician with the means to checkmate Mr Berlusconi is the very one with least to gain from doing so.

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The administration is obviously trying to "checkmate" a nearly identical proposal floated by Republican Sen.

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The number of different types of chess problems is bewildering, from the familiar checkmate to helpmates, selfmates, series movers and series helpmates.

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