MESON Chess Problem Database

Problem Display
PID: 167751 (k7/8/8/N4K2/8/r7/7Q/R2B4 w - - 0 1)

Lincoln, Robert A

StrateGems, 2017

k7/8/8/N4K2/8/r7/7Q/R2B4

#2

5 + 2

SOLUTION

  • SOUND
  • Tries
    • 1.Qh1+?
      • 1...Ka7
        • 2.Qb7#
      • 1...Kb8
        • 2.Qb7#
      • 1...Rf3+!
    • 1.Qg2+?
      • 1...Ka7
        • 2.Qb7#
      • 1...Kb8
        • 2.Qb7#
      • 1...Rf3+!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qb7#
      • 1...Rf3+
        • 2.Bxf3#
      • 1...Rxa5+
        • 2.Rxa5#
      • 1...Rb3
        • 2.Sxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
      • Refutation
        • R(a);CHECK,P_SPINR(a)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
      • Refutation
        • R(a);CHECK,P_SPINR(a)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • R(a);CHECK,N_GUARD::B(B),XR(a)
      • R(a);CHECK,OGATE,P_SPINR(a),XS(D)::R(A),XR(a)
      • R(a);::R(A)+S(D),XR(a)
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