MESON Chess Problem Database

Problem Display
PID: 176180 (1Q6/1n6/k2p4/3K4/1P6/8/8/1R6 w - - 0 1)

Petkov, Petko Andonov

Schach-Echo, 1962

1Q6/1n6/k2p4/3K4/1P6/8/8/1R6

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sa5
      • 2.b5#
    • 1...Sd8
      • 2.Ra1#
  • Tries
    • 1.Ra1+?
      • 1...Kb5
        • 2.Qxb7#
      • 1...Sa5
        • 2.Rxa5#
        • 2.b5#
      • 1...Kb6!
    • 1.b5+?
      • 1...Ka5
        • 2.Qa7#
      • 1...Kb6!
  • Keys
    • 1.Qc7!
      • 1...Kb5
        • 2.Qc6#
      • 1...Ka7
        • 2.Ra1#
      • 1...Sa5
        • 2.b5#
      • 1...Sc5
        • 2.b5#
      • 1...Sd8
        • 2.b5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(c);SBLOCK::P(B)
    • S(c);N_GUARD::R(A)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(a);P_SPINS(c),S_FLIGHT::QAR2(D),XS(c)
      • Refutation
        • K(a);P-FLIGHT,P_SPINS(c)
    • Try
      • P(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(D)
      • Refutation
        • K(a);P-FLIGHT,P_SPINS(c)
  • Actual
    • Q(D);
    • Vars
      • K(a);S_FLIGHT::QAB1(D)
      • K(a);P-FLIGHT,P_SPINS(c)::R(A)
      • S(c);::P(B)
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