MESON Chess Problem Database

Problem Display
PID: 15 (Kb1R2q1/N7/3N2R1/2pkpB2/3P3r/8/3Q4/7b w - - 0 1)

Blake, Percy Francis

Recomm., BCF 004. Ty., 1930-1931

Kb1R2q1/N7/3N2R1/2pkpB2/3P3r/8/3Q4/7b

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qe6
      • 2.Bxe6#
    • 1...Qh7
      • 2.Be6#
    • 1...Qg7
      • 2.Be6#
    • 1...Qf8
      • 2.Be6#
    • 1...Qh8
      • 2.Be6#
    • 1...cxd4
      • 2.Qa5#
  • Tries
    • 1.Sc4+?
      • 1...Qxd8
        • 2.Se3#
      • 1...Bd6
        • 2.Se3#
        • 2.Sb6#
      • 1...Kxc4+!
    • 1.Qa2+?
      • 1...c4
        • 2.Qxc4#
      • 1...Kxd4+!
  • Keys
    • 1.Bd3!
      • threat
        • 2.Bc4#
      • 1...Kxd4+
        • 2.Be4#
      • 1...Bxd6
        • 2.Rxd6#
      • 1...Bxa7
        • 2.Se8#
      • 1...cxd4
        • 2.Qa5#
      • 1...exd4
        • 2.Qg5#
      • 1...c4
        • 2.Bxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(g);N_GUARD::B(C),XQ(g)
    • Q(g);N_GUARD::B(C)
    • P(c);OGATEB,P_SPINP(c),SBLOCK,XP(B)::QAR(A)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • Q(g);XR(H)::S(D)
      • Refutation
        • K(d);CHECK,S_FLIGHT,XS(D)
    • Try
      • Q(A);CHECK
      • Vars
        • P(c);P_SPINP(c)::QAB1(A),XP(c)
      • Refutation
        • K(d);CHECK,P-FLIGHT,XP(B)
  • Actual
    • B(C);
    • Threat
      • B(C)
    • Vars
      • K(d);CHECK,P-FLIGHT,XP(B)::QAR(A)+B(C)
      • B(f);OGATE,P_PINR(H),P_SPINB(f),XS(D)::R1(E),XB(f)
      • B(f);N_GUARD,P_PINR(H),XS(F)::R(H)+S(D)
      • P(c);OGATEB,SBLOCK,XP(B)::QAR(A)
      • P(e);OGATEB,SBLOCK,XP(B)::QAR(A)
      • P(c);::B(C),XP(c)
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