MESON Chess Problem Database

Problem Display
PID: 81341 (N2b4/Q7/K5B1/pP1ppp1p/k5qR/P1R3p1/P7/2B5 w - - 0 1)

Allison, Christopher John

The Field, 1951

(First published on Sat Jul 14 1951)

N2b4/Q7/K5B1/pP1ppp1p/k5qR/P1R3p1/P7/2B5

#2

10 + 9

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Bxh4
      • 2.Sb6#
    • 1...Bg5
      • 2.Sb6#
    • 1...Bb6
      • 2.Sxb6#
    • 1...Bf6
      • 2.Sb6#
    • 1...Be7
      • 2.Sb6#
    • 1...d4
      • 2.Rc4#
    • 1...e4
      • 2.Qd4#
    • 1...f4
      • 2.Bc2#
  • Tries
    • 1.Bxf5?
      • threat
        • 2.Bc2#
      • 1...e4
        • 2.Qd4#
      • 1...Qe4!
    • 1.Rxg4+?
      • 1...d4
        • 2.Rc4#
      • 1...e4
        • 2.Qd4#
      • 1...fxg4
        • 2.Bc2#
      • 1...f4
        • 2.Bc2#
      • 1...hxg4!
    • 1.Qd7?
      • threat
        • 2.b6#
      • 1...Bb6
        • 2.Sxb6#
      • 1...f4
        • 2.Bc2#
      • 1...Qc4!
    • 1.b6?
      • threat
        • 2.Be8#
        • 2.Qd7#
      • 1...Bc7
        • 2.Be8#
      • 1...f4
        • 2.Bc2#
      • 1...Qc4+!
  • Keys
    • 1.Qg1!
      • threat
        • 2.Qd1#
      • 1...Bxh4
        • 2.Sb6#
      • 1...d4
        • 2.Rc4#
      • 1...e4
        • 2.Qd4#
      • 1...f4
        • 2.Bc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • B(i);N_GUARD,N_SPINQ(c),SBLOCK,XR(E)::S(J)
    • B(i);N_GUARD::S(J)
    • B(i);N_GUARD::S(J),XB(i)
    • P(e);N_GUARD,N_SPINQ(c),S_CUTQ(c)::R(D)
    • P(f);N_GUARD,N_SPINQ(c),S_CUTQ(c)::QAR(I)
    • P(g);N_SPINQ(c),OGATE::B(H)
  • Tries
    • Try
      • B(H);XP(g)
      • Threat
        • B(H)
      • Vars
        • P(f);N_GUARD,N_SPINQ(c),S_CUTQ(c)::QAR(I)
      • Refutation
        • Q(c);
    • Try
      • R(E);CHECK,XQ(c)
      • Vars
        • P(e);N_GUARD,P_SPINP(e)::R(D)
        • P(f);N_GUARD,P_SPINP(f)::QAR(I)
        • P(g);OGATE,XR(E)::B(H)
        • P(g);OGATE,P_SPINP(g)::B(H)
      • Refutation
        • P(h);XR(E)
    • Try
      • Q(I);
      • Threat
        • QAB(I)+P(F)
      • Vars
        • B(i);N_GUARD::S(J),XB(i)
        • P(g);N_SPINQ(c),OGATE::B(H)
      • Refutation
        • Q(c);P_PINP(F)
    • Try
      • P(F);
      • Threat
        • DUALS(2)
      • Vars
        • B(i);::B(H)
        • P(g);N_SPINQ(c),OGATE::B(H)
      • Refutation
        • Q(c);CHECK
  • Actual
    • Q(I);
    • Threat
      • QAB(I)
    • Vars
      • B(i);N_GUARD,N_SPINQ(c),SBLOCK,XR(E)::S(J)
      • P(e);N_GUARD,N_SPINQ(c),S_CUTQ(c)::R(D)
      • P(f);N_GUARD,N_SPINQ(c),S_CUTQ(c)::QAR(I)
      • P(g);N_SPINQ(c),OGATE::B(H)
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