MESON Chess Problem Database

Problem Display
PID: 67566 (1B5b/7n/n5B1/1R2p3/3k2qR/1P4Nb/3PP3/3K4 w - - 0 1)

Lish, G

Chess, 1948

1B5b/7n/n5B1/1R2p3/3k2qR/1P4Nb/3PP3/3K4

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Rxe4#
    • 1...Qf4
      • 2.e3#
    • 1...Qxh4
      • 2.e3#
    • 1...Sb4
      • 2.Ba7#
    • 1...Sc7
      • 2.Ba7#
    • 1...Sf6
      • 2.Bxe5#
  • Tries
    • 1.Bf7?
      • threat
        • 2.Rd5#
      • 1...Sb4
        • 2.Ba7#
      • 1...Sc5
        • 2.Rb4#
      • 1...Sc7
        • 2.Ba7#
      • 1...Sf6
        • 2.Bxe5#
      • 1...Bg2!
    • 1.Rxg4+?
      • 1...e4
        • 2.Sf5#
        • 2.Rxe4#
      • 1...Bxg4!
  • Keys
    • 1.Be4!
      • threat
        • 2.Rd5#
      • 1...Qxe2+
        • 2.Sxe2#
      • 1...Qxe4
        • 2.Rxe4#
      • 1...Qe6
        • 2.e3#
      • 1...Qd7
        • 2.e3#
      • 1...Qg8
        • 2.e3#
      • 1...Sb4
        • 2.Ba7#
      • 1...Sc5
        • 2.Rb4#
      • 1...Sc7
        • 2.Ba7#
      • 1...Sf6
        • 2.Bxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_PINP(C),OGATE::R1(F),XQ(c)
    • Q(c);N_PINP(C)::P(C)
    • Q(c);N_PINP(C),N_SPINQ(c),XR(F)::P(C)
    • S(e);N_GUARD::B(I)
    • S(f);S_CUTB(g)::B(I),XP(d)
  • Tries
    • Try
      • B(H);
      • Threat
        • R1(G)
      • Vars
        • S(e);N_GUARD::B(I)
        • S(e);N_GUARD,SBLOCK::R(G)
        • S(f);S_CUTB(g)::B(I),XP(d)
      • Refutation
        • B(a);
    • Try
      • R(F);CHECK,N_SPINP(C),XQ(c)
      • Refutation
        • B(a);P_PINP(C),XR(F)
  • Actual
    • B(H);N_PINQ(c)
    • Threat
      • R1(G)
    • Vars
      • Q(c);CHECK,XP(C)::S(E),XQ(c)
      • Q(c);N_PINP(C),OGATE,P_SPINQ(c),XB(H)::R1(F),XQ(c)
      • Q(c);N_PINP(C)::P(C)
      • S(e);N_GUARD::B(I)
      • S(e);N_GUARD,SBLOCK::R(G)
      • S(f);S_CUTB(g)::B(I),XP(d)
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