MESON Chess Problem Database

Problem Display
PID: 57852 (1B6/7Q/R3N3/3p2p1/3P2kp/5r1R/8/3B2nK w - - 0 1)

Lubell, Martin S

Chess Life, 1957

1B6/7Q/R3N3/3p2p1/3P2kp/5r1R/8/3B2nK

#2

8 + 6

SOLUTION

  • SOUND
  • Tries
    • 1.Kg2?
      • 1...Sxh3
        • 2.Bxf3#
      • 1...Se2!
    • 1.Bxf3+?
      • 1...Kxh3
        • 2.Sxg5#
      • 1...Sxf3!
    • 1.Qe4+?
      • 1...Kxh3
        • 2.Sxg5#
      • 1...Kh5
        • 2.Sg7#
      • 1...dxe4!
    • 1.Qf5+?
      • 1...Kh5
        • 2.Sf4#
        • 2.Sg7#
        • 2.Qxg5#
      • 1...Kxf5!
    • 1.Qxh4+?
      • 1...Kf5
        • 2.Sg7#
      • 1...gxh4!
    • 1.Qf7?
      • 1...Sxh3
        • 2.Bxf3#
        • 2.Qxf3#
      • 1...Se2
        • 2.Qxf3#
      • 1...Kxh3!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Sf4#
        • 2.Sg7#
      • 1...Kxh3
        • 2.Sxg5#
      • 1...Kf5
        • 2.Sc5#
      • 1...Kh5
        • 2.Sg7#
      • 1...Sxh3
        • 2.Sg7#
      • 1...Se2
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • S(a);N_GUARD,XR(C)::B(A),XR(b)
      • Refutation
        • S(a);N_SPINR(b)
    • Try
      • B(A);CHECK,XR(b)
      • Vars
        • K(c);P_SPINP(d),S_FLIGHT,XR(C)::S(F),XP(f)
      • Refutation
        • S(a);XB(A)
    • Try
      • Q(G);CHECK
      • Vars
        • K(c);N_SPINR(b),S_FLIGHT,XR(C)::S(F),XP(f)
        • K(c);P_SPINP(d),S_FLIGHT::S(F)
      • Refutation
        • P(e);XQ(G)
    • Try
      • Q(G);CHECK
      • Refutation
        • K(c);N_SPINR(b),S_FLIGHT,XQ(G)
    • Try
      • Q(G);CHECK,XP(d)
      • Vars
        • K(c);N_SPINR(b),S_FLIGHT::S(F)
      • Refutation
        • P(f);XQ(G)
    • Try
      • Q(G);
      • Vars
        • S(a);N_GUARD,N_SPINR(b)::QAB1(G),XR(b)
      • Refutation
        • K(c);N_SPINR(b),S_FLIGHT,XR(C)
  • Actual
    • Q(G);
    • Threat
      • DUALS(2)
    • Vars
      • K(c);N_SPINR(b),S_FLIGHT,XR(C)::QAB(G)+S(F),DCHECK,XP(f)
      • K(c);N_SPINR(b),S_FLIGHT::QAB(G)+S(F)
      • K(c);P_SPINP(d),S_FLIGHT::S(F)
      • S(a);SBLOCK,XR(C)::QAB(G)+S(F)
      • S(a);N_SPINR(b)::QAB(G)+S(F)
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