MESON Chess Problem Database

Problem Display
PID: 140790 (8/5bp1/Rr2q1kP/3NP3/5R1Q/6P1/B7/6K1 w - - 0 1)

Feenstra Kuiper, Pieter

Het Half Pin Thema (II), 1947

8/5bp1/Rr2q1kP/3NP3/5R1Q/6P1/B7/6K1

#2

9 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qe7
      • 2.Bb1#
    • 1...Qe8
      • 2.Bb1#
    • 1...Rb1+
      • 2.Bxb1#
  • Tries
    • 1.Se7+?
      • 1...Qxe7
        • 2.Bb1#
      • 1...Kh7!
    • 1.Bb1+?
      • 1...Qf5
        • 2.Bxf5#
      • 1...Rxb1+!
    • 1.Qg5+?
      • 1...Kh7
        • 2.Qxg7#
      • 1...Kxg5!
  • Keys
    • 1.h7!
      • threat
        • 2.h8S#
      • 1...Rb1+
        • 2.Bxb1#
      • 1...Qc8
        • 2.Se7#
      • 1...Qe8
        • 2.Bb1#
      • 1...Rb8
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_GUARD,P_SPINR(a)::B(B)
    • R(a);CHECK,N_GUARD,P_SPINQ(b)::B(B),XR(a)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • Q(b);P_SPINR(a),XS(F)::B(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • B(B);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b),P_SPINR(a)::B(B),XQ(b)
      • Refutation
        • R(a);CHECK,P_SPINQ(b),XB(B)
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);OGATE,S_FLIGHT::QAR1(E),XP(e)
      • Refutation
        • K(c);P-FLIGHT,XQ(E)
  • Actual
    • P(I);
    • Threat
      • P=S
    • Vars
      • R(a);CHECK,N_GUARD,P_SPINQ(b)::B(B),XR(a)
      • Q(b);N_GUARD,P_SPINR(a)::S(F)
      • Q(b);N_GUARD,P_SPINR(a)::B(B)
      • R(a);P_SPINQ(b)::S(F)
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