MESON Chess Problem Database

Problem Display
PID: 264246 (7k/8/r4RKN/8/8/8/8/5Q2 w - - 0 1)

Salai (Snr), Ladislav

Prace, 1983

7k/8/r4RKN/8/8/8/8/5Q2

#2

4 + 2

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Rf8#
    • 1...Ra2
      • 2.Rf8#
    • 1...Ra3
      • 2.Rf8#
    • 1...Ra4
      • 2.Rf8#
    • 1...Ra5
      • 2.Rf8#
    • 1...Rxf6+
      • 2.Qxf6#
    • 1...Ra7
      • 2.Rf8#
  • Tries
    • 1.Rb6?
      • threat
        • 2.Qf6#
        • 2.Qf8#
      • 1...Ra7
        • 2.Rb8#
        • 2.Qf8#
      • 1...Ra8
        • 2.Qf6#
      • 1...Rxb6+!
    • 1.Rc6?
      • threat
        • 2.Qf6#
        • 2.Qf8#
      • 1...Ra7
        • 2.Rc8#
        • 2.Qf8#
      • 1...Ra8
        • 2.Qf6#
      • 1...Rxc6+!
    • 1.Rd6?
      • threat
        • 2.Qf6#
        • 2.Qf8#
      • 1...Ra7
        • 2.Rd8#
        • 2.Qf8#
      • 1...Ra8
        • 2.Qf6#
      • 1...Rxd6+!
    • 1.Re6?
      • threat
        • 2.Qf6#
        • 2.Qf8#
      • 1...Ra7
        • 2.Re8#
        • 2.Qf8#
      • 1...Ra8
        • 2.Qf6#
      • 1...Rxe6+!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Rxa6#
      • 1...Rxf6+
        • 2.Qxf6#
      • 1...Rxa1
        • 2.Rf8#
      • 1...Re6
        • 2.Rxe6#
      • 1...Ra2
        • 2.Rf8#
      • 1...Ra3
        • 2.Rf8#
      • 1...Ra4
        • 2.Rf8#
      • 1...Ra5
        • 2.Rf8#
      • 1...Rb6
        • 2.Rxb6#
      • 1...Rc6
        • 2.Rxc6#
      • 1...Rd6
        • 2.Rxd6#
      • 1...Ra7
        • 2.Rf8#
      • 1...Ra8
        • 2.Ra6#
        • 2.Rf8#
        • 2.Qxa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(a);N_PINR(B)::R(B)
    • R(a);CHECK,OGATE,XR(B)::QAB(A),XR(a)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);N_PINR(B),SBLOCK::QAB(A)
      • Refutation
        • R(a);CHECK,XR(B)
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);N_PINR(B),SBLOCK::QAB(A)
      • Refutation
        • R(a);CHECK,XR(B)
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);N_PINR(B),SBLOCK::QAB(A)
      • Refutation
        • R(a);CHECK,XR(B)
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);N_PINR(B),SBLOCK::QAB(A)
      • Refutation
        • R(a);CHECK,XR(B)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+R(B),XR(a)
    • Vars
      • R(a);CHECK,OGATE,P_SPINR(a),XR(B)::QAB(A),XR(a)
      • R(a);N_PINR(B),XQ(A)::R(B)
      • R(a);N_GUARD::QAB(A)+R(B),XR(a)
      • R(a);N_PINR(B)::QAB(A)+R(B),DCHECK
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