MESON Chess Problem Database

Problem Display
PID: 23884 (r1n5/1k6/p7/K7/8/8/8/2R2Q2 w - - 0 1)

Lincoln, Robert A

Fun with Chess Miniatures, 1996

r1n5/1k6/p7/K7/8/8/8/2R2Q2

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.Qxa6#
  • Tries
    • 1.Qb5+?
      • 1...Ka7
        • 2.Rc7#
      • 1...Sb6
        • 2.Qxb6#
      • 1...axb5+!
    • 1.Qxa6+?
      • 1...Kb8
        • 2.Rxc8#
      • 1...Rxa6+!
    • 1.Qf7+?
      • 1...Kb8
        • 2.Qc7#
      • 1...Se7!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qc7#
      • 1...Ka7
        • 2.Qc7#
      • 1...Kb8
        • 2.Qc7#
      • 1...Ra7
        • 2.Qxc8#
      • 1...Rb8
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD,SBLOCK::QAB1(B),XP(a)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::R(A)
        • S(d);N_GUARD,P_SPINS(d)::QAR1(B),XS(d)
      • Refutation
        • P(a);CHECK,XQ(B)
    • Try
      • Q(B);CHECK,P_SPINQ(B),XP(a)
      • Vars
        • K(b);P-FLIGHT::R1(A),XS(d)
      • Refutation
        • R(c);CHECK,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(B)
      • Refutation
        • S(d);P_SPINS(d)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(b);P-FLIGHT::QAR2(B)
      • K(b);P-FLIGHT::QAB1(B)
      • R(c);N_GUARD,SBLOCK::QAB1(B),XS(d)
      • R(c);N_GUARD,SBLOCK::QAB1(B),XP(a)
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Developed and maintained by Brian Stephenson.
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