Chess Board
[ECO code A28] Move Move Here
Four Knights Variation

White's dark Bishop under threat on KKt5(g5) retreats to KR4(h4) maintaining the Kt+Q pin.
Black's Bishop on QKt5(b4) removes White's knight on QB6(c3) for check, threatening 8..BxKt.
    White  Black	White  Black
 1. P-QB4  P-K4	     6.	B-Kt5  P-KR3
 2. Kt-QB3 Kt-QB3    7.	B-R4   BxKt ch
 3. Kt-B3  Kt-B3
 4. P-Q4   PxP
 5. KtxP   B-Kt5

WHITE to Move or Undo or Jump or Clear
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