MESON Chess Problem Database

Problem Display
PID: 172297 (6B1/5P1q/6Pk/8/3Q3K/8/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Vecherni Krasnodar, 1996

6B1/5P1q/6Pk/8/3Q3K/8/8/8

#2

5 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.f8Q+?
      • 1...Qg7
        • 2.Qdxg7#
        • 2.Qfxg7#
      • 1...Kxg6+!
    • 1.f8B+?
      • 1...Qg7
        • 2.Qxg7#
      • 1...Kxg6+!
  • Keys
    • 1.Qf6!
      • threat
        • 2.gxh7#
      • 1...Qxg6
        • 2.f8Q#
        • 2.f8B#
      • 1...Qxg8
        • 2.fxg8S#
      • 1...Qxf7
        • 2.gxf7#
      • 1...Qg7
        • 2.Qg5#
      • 1...Qh8
        • 2.g7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • P(D);CHECK
      • Refutation
        • K(a);CHECK,P-FLIGHT,XP(C)
    • Try
      • P(D);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAB1(A),XQ(b)
      • Refutation
        • K(a);CHECK,P-FLIGHT,XP(C)
  • Actual
    • Q(A);
    • Threat
      • QAR(A)+P(C),XQ(b)
    • Vars
      • Q(b);N_GUARD,P_SPINQ(b),XP(C)::P=Q
      • Q(b);OGATE,XB(E)::PXQ(b)=S
      • Q(b);OGATE,XP(D)::QAR(A)+P(C),XQ(b)
      • Q(b);SBLOCK::QAB1(A)
      • Q(b);N_GUARD::QAR(A)+P(C)
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