MESON Chess Problem Database

Problem Display
PID: 176176 (3k1K2/1pR2p2/8/8/2Q5/8/8/3r4 w - - 0 1)

Petkov, Petko Andonov

Schach-Echo, 1962

3k1K2/1pR2p2/8/8/2Q5/8/8/3r4

#2

3 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rd7
      • 2.Rc8#
  • Tries
    • 1.Rxb7?
      • threat
        • 2.Qc7#
      • 1...Rd7
        • 2.Rb8#
      • 1...Rc1!
    • 1.Re7?
      • threat
        • 2.Qc7#
      • 1...Rd7
        • 2.Re8#
      • 1...Rc1!
    • 1.Qxf7?
      • threat
        • 2.Qe7#
      • 1...Rd7
        • 2.Qxd7#
      • 1...Re1
        • 2.Qd7#
      • 1...Rf1!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qe7#
      • 1...Re1
        • 2.Qd6#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Rd7
        • 2.Rc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(a);SBLOCK::R1(B)
  • Tries
    • Try
      • R(B);XP(b)
      • Threat
        • QAB1(A)
      • Vars
        • R(a);SBLOCK::R(B)
      • Refutation
        • R(a);
    • Try
      • R(B);
      • Threat
        • QAB1(A)
      • Vars
        • R(a);SBLOCK::R1(B)
      • Refutation
        • R(a);
    • Try
      • Q(A);XP(c)
      • Threat
        • QAB1(A)
      • Vars
        • R(a);N_GUARD::QAR1(A),XR(a)
        • R(a);N_GUARD::QAR1(A)
      • Refutation
        • R(a);P_PINQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • R(a);N_GUARD::QAR2(A)
      • R(a);N_GUARD::QAR2(A),XR(a)
      • R(a);SBLOCK::R1(B)
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