MESON Chess Problem Database

Problem Display
PID: 80860 (6R1/4kp2/2KpP3/8/8/4Q3/8/8 w - - 0 1)

Lebedev, Leonid Arsentevich

Babruiskae zhytisse, 1998

6R1/4kp2/2KpP3/8/8/4Q3/8/8

#2

4 + 3

145 StrateGems 2008

SOLUTION

  • SOUND
  • Tries
    • 1.Qf4?
      • threat
        • 2.Qxf7#
      • 1...Kxe6
        • 2.Re8#
      • 1...fxe6
        • 2.Qf8#
      • 1...f6
        • 2.Qxd6#
      • 1...f5!
    • 1.Qg5+?
      • 1...Kxe6
        • 2.Re8#
      • 1...f6!
    • 1.exf7+?
      • 1...Kf6
        • 2.f8Q#
        • 2.f8R#
      • 1...Kxf7!
  • Keys
    • 1.Kd5!
      • 1...fxe6+
        • 2.Qxe6#
      • 1...Kf6
        • 2.Qg5#
      • 1...f5
        • 2.Qg5#
      • 1...f6
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(c)
      • Vars
        • K(b);P-FLIGHT,XP(C)::R(D)
        • P(c);OGATE,SBLOCK,XP(C)::QAB1(A)
        • P(c);SBLOCK::QAB1(A),XP(a)
      • Refutation
        • P(c);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT,XP(C)::R(D)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • P(C);CHECK,XP(c)
      • Vars
        • K(b);S_FLIGHT::P=Q
      • Refutation
        • K(b);P-FLIGHT,XP(C)
  • Actual
    • K(B);S_FLIGHT
    • Vars
      • P(c);CHECK,OGATE,P_SPINP(c),XP(C)::QAR1(A),XP(c)
      • K(b);S_FLIGHT::QAB1(A)
      • P(c);N_GUARD::QAB(A)
      • P(c);SBLOCK::QAR(A)
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