MESON Chess Problem Database

Problem Display
PID: 100933 (8/5K2/2P1R3/3kN3/N3q2R/5B2/2r2pQ1/8 w - - 0 1)

Feenstra Kuiper, Pieter

Good Companions, 1920

8/5K2/2P1R3/3kN3/N3q2R/5B2/2r2pQ1/8

#2

8 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf3+
      • 2.Qxf3#
  • Tries
    • 1.Qxf2?
      • threat
        • 2.Sb6#
        • 2.Bxe4#
      • 1...Qxf3+
        • 2.Qxf3#
      • 1...Rxc6
        • 2.Bxe4#
        • 2.Qd2#
      • 1...Rb2
        • 2.Sc3#
        • 2.Bxe4#
        • 2.Qc5#
      • 1...Re2
        • 2.Sc3#
        • 2.Sb6#
        • 2.Qc5#
      • 1...Rc4
        • 2.Sb6#
      • 1...Rxf2!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qd8#
      • 1...Qxf3+
        • 2.Sxf3#
      • 1...Kd4
        • 2.Rd6#
      • 1...Rxc6
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(c);CHECK,OGATE,XB(B)::QAB(A),XQ(c)
  • Tries
    • Try
      • Q(A);XP(b)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,N_SPINQ(c),OGATE,XB(B)::QAB(A),XQ(c)
        • R(a);::S(C)
      • Refutation
        • R(a);P_PINB(B),XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR(A)
    • Vars
      • Q(c);CHECK,N_SPINQ(c),XB(B)::QAR(A)+S(E),XQ(c)
      • K(d);P-FLIGHT::R(G)
      • R(a);N_GUARD,XP(F)::QAR(A)
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