MESON Chess Problem Database

Problem Display
PID: 88770 (k1K4Q/7N/8/2P5/r7/8/8/1R6 w - - 0 1)

Lincoln, Robert A

The Problemist, 1992

k1K4Q/7N/8/2P5/r7/8/8/1R6

#2

5 + 2

6490 yacpdb 2009
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Rxa1#
      • 2.Qxa1#
    • 1...Ra7
      • 2.Rb8#
  • Tries
    • 1.Ra1?
      • threat
        • 2.Rxa4#
      • 1...Ka7
        • 2.Rxa4#
      • 1...Rxa1
        • 2.Qxa1#
      • 1...Ra2
        • 2.Rxa2#
      • 1...Ra3
        • 2.Rxa3#
      • 1...Ra5
        • 2.Rxa5#
      • 1...Ra6
        • 2.Rxa6#
      • 1...Ra7!
    • 1.Qb2?
      • threat
        • 2.Qb7#
        • 2.Qb8#
      • 1...Ka7
        • 2.Qb7#
      • 1...Ra7
        • 2.Qb8#
      • 1...Rb4!
    • 1.Qg7?
      • threat
        • 2.Rb8#
        • 2.Qb7#
      • 1...Ra7
        • 2.Rb8#
      • 1...Rb4!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qxa4#
      • 1...Ka7
        • 2.Qxa4#
      • 1...Rxa1
        • 2.Rxa1#
      • 1...Ra2
        • 2.Qxa2#
      • 1...Ra3
        • 2.Qxa3#
      • 1...Ra5
        • 2.Qxa5#
      • 1...Ra6
        • 2.Qxa6#
      • 1...Ra7
        • 2.Rb8#

Anticipated by 103770(1990)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(a);SBLOCK::R1(A)
  • Tries
    • Try
      • R(A);P_PINR(a)
      • Threat
        • R(A),XR(a)
      • Vars
        • K(b);P-FLIGHT::R(A),XR(a)
        • R(a);N_SPINR(a),OGATE,XR(A)::QAB(E),XR(a)
        • R(a);OGATEB::R(A),XR(a)
        • R(a);OGATE::R(A),XR(a)
      • Refutation
        • R(a);
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR1(E)
        • R(a);::QAR1(E)
      • Refutation
        • R(a);
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::R1(A)
      • Refutation
        • R(a);
  • Actual
    • Q(E);P_PINR(a)
    • Threat
      • QAR(E),XR(a)
    • Vars
      • K(b);P-FLIGHT::QAR(E),XR(a)
      • R(a);N_SPINR(a),OGATE,XQ(E)::R(A),XR(a)
      • R(a);OGATEB::QAR(E),XR(a)
      • R(a);OGATE::QAR(E),XR(a)
      • R(a);OGATE::QAR2(E),XR(a)
      • R(a);::R1(A)
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