The Chigorin Defense was invented by the Russian chess player Mikhail Chigorin (1850-1908)
Chigorin did not put as much value on the bishop pair as other masters. In this opening you must be prepared to give bishop for knight in the variation 1.d4 d5 2.c4 Nc6 3.cxd Qxd 4.e3 e5 5. Nc3 (attacking the queen) Bb4 6.Bd2 BxN. (See diagram below)
The queen is attacked now and Black should trade bishop for knight.
Black violates chess principles in the Chigorin defence.
This is not the way modern grandmasters play the game so the Chigorin is not played at high level chess events like world championships and is just used by masters as a surpize weapon in lower level chess tournaments.
The theory is not as much developed as in other more popular chess openings.
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