MESON Chess Problem Database

Problem Display
PID: 98481 (8/7K/8/1p6/k7/8/1Q5R/8 w - - 0 1)

Petkov, Petko Andonov

Problemas, 1963

8/7K/8/1p6/k7/8/1Q5R/8

#2

3 + 2

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Rh4+?
      • 1...b4
        • 2.Qxb4#
      • 1...Ka5!
    • 1.Rh6?
      • threat
        • 2.Ra6#
      • 1...Ka5
        • 2.Qa3#
      • 1...b4!
  • Keys
    • 1.Rh5!
      • 1...Ka5
        • 2.Qxb5#
      • 1...b4
        • 2.Qa2#

This anticipates 245564(1989)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • P(b);P_SPINP(b)::QAR1(A),XP(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(B);
      • Threat
        • R(B)
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • P(b);
  • Actual
    • R(B);
    • Vars
      • K(a);P-FLIGHT,P_SPINP(b)::QAR1(A),XP(b)
      • P(b);SBLOCK::QAR2(A)
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