MESON Chess Problem Database

Problem Display
PID: 188020 (2b5/2Np4/pp1Np3/1Pk1p3/p6p/2b5/K1Q2r1r/1R1R2BB w - - 0 1)

Byas, Walter

The Observer, 1936

(First published on Sun Nov 8 1936)

2b5/2Np4/pp1Np3/1Pk1p3/p6p/2b5/K1Q2r1r/1R1R2BB

#2

9 + 12

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxh1
      • 2.Bxf2#
    • 1...axb5
      • 2.Rxb5#
  • Tries
    • 1.Bd5?
      • threat
        • 2.Se4#
      • 1...exd5
        • 2.Rxd5#
      • 1...e4
        • 2.Sxe4#
      • 1...Kxd6!
    • 1.Bb7?
      • threat
        • 2.Sxa6#
      • 1...axb5
        • 2.Sa6#
        • 2.Rxb5#
      • 1...a5
        • 2.Sa6#
      • 1...Bxb7!
    • 1.Rb4?
      • threat
        • 2.Rc4#
      • 1...axb5
        • 2.Rxb5#
      • 1...Kxb4!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Se4#
      • 1...axb5
        • 2.Rxb5#
      • 1...Bb2
        • 2.Qc4#
      • 1...Bd2
        • 2.Qxe5#
      • 1...Bb7
        • 2.Sxb7#
      • 1...e4
        • 2.Sxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD,XB(D)::B(C),XR(a)
    • P(h);OGATE,XP(G)::R1(A),XP(h)
  • Tries
    • Try
      • B(D);
      • Threat
        • S(H)
      • Vars
        • P(j);OGATE,XB(D)::R1(B),XP(j)
        • P(g);::S(H),XP(g)
      • Refutation
        • K(f);N_SPINB(c),N_SPINR(a),S_FLIGHT,XS(H)
    • Try
      • B(D);
      • Threat
        • S(I),XP(h)
      • Vars
        • P(h);::S(I)
      • Refutation
        • B(l);XB(D)
    • Try
      • R(A);
      • Threat
        • R1(A)
      • Vars
        • P(h);OGATE,XP(G)::R1(A),XP(h)
      • Refutation
        • K(f);N_SPINB(c),N_SPINR(a),S_FLIGHT,XR(A)
  • Actual
    • Q(F);N_PINB(c)
    • Threat
      • S(H)
    • Vars
      • P(h);OGATE,XP(G)::R1(A),XP(h)
      • B(c);N_PINQ(F)::QAR1(F)
      • B(c);N_PINQ(F)::QAR2(F),XP(g)
      • B(l);N_GUARD::S(H),XB(l)
      • P(g);::S(H),XP(g)
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