MESON Chess Problem Database

Problem Display
PID: 155731 (1B4R1/7r/7R/7N/8/4b1PN/4K2k/5Q1n w - - 0 1)

Barnes, Barry Peter

Problemskak, 2008

1B4R1/7r/7R/7N/8/4b1PN/4K2k/5Q1n

#2

8 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sxg3+
      • 2.Bxg3#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Sf3#
      • 1...Sxg3+
        • 2.Bxg3#
      • 1...Rf7
        • 2.Sf6#
        • 2.Sg7#
      • 1...Bxg5!
    • 1.S5f4?
      • threat
        • 2.Qg2#
      • 1...Bxf4
        • 2.Qg1#
      • 1...Sxg3+!
    • 1.Qg1+?
      • 1...Kxh3
        • 2.Sf4#
        • 2.Qxh1#
      • 1...Bxg1!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Sg4#
      • 1...Sxg3+
        • 2.Bxg3#
      • 1...Rc7
        • 2.Sf4#
      • 1...Rg7
        • 2.Sg5#
      • 1...Bf4
        • 2.Qg1#
      • 1...Sf2
        • 2.Qg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);CHECK,OGATE,P_SPINS(a),XP(C)::B(G),XS(a)
  • Tries
    • Try
      • S(D);
      • Threat
        • S(D)
      • Vars
        • S(a);CHECK,OGATE,P_SPINS(a),XP(C)::B(G),XS(a)
      • Refutation
        • B(c);XS(D)
    • Try
      • S(E);
      • Threat
        • QAR1(A)
      • Vars
        • B(c);N_GUARD,XS(E)::QAB1(A)
      • Refutation
        • S(a);CHECK,XP(C)
    • Try
      • Q(A);CHECK
      • Refutation
        • B(c);XQ(A)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • S(a);CHECK,OGATE,P_SPINS(a),XP(C)::B(G),XS(a)
      • R(d);N_GUARD::R(F)+S(D)
      • B(c);N_GUARD::QAB1(A)
      • S(a);S_CUTB(c)::QAB1(A)
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