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Solution to Puzzle 4.  CHESS PUZZLE

White to move, mate in three.


1.  P-QB4
if  1.  ......   any R - R5, 2. P-Q4  any move
if  1.  .....    any R - R6, 2. P-Q3  any move
3. P-N5 + mate

if 1 ... P-QB4 (black threatening N-Q3 defending QN4) 
2. N-Q3 any move
3 N-B5+ mate


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