MESON Chess Problem Database

Problem Display
PID: 232847 (1n4QK/r1b5/5pN1/5k1P/1r6/2B2P1P/2R5/1B3R1N w - - 0 1)

Ellerman, Arnoldo

Il Due Mosse, 1958

1n4QK/r1b5/5pN1/5k1P/1r6/2B2P1P/2R5/1B3R1N

#2

11 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Se7#
    • 1...Bf4
      • 2.Sh4#
    • 1...Ba5
      • 2.Qd5#
    • 1...Bb6
      • 2.Qd5#
    • 1...Bd8
      • 2.Qd5#
  • Tries
    • 1.Bxb4?
      • threat
        • 2.Rg2#
        • 2.Rc5#
      • 1...Ra1
        • 2.Rc5#
      • 1...Ra2
        • 2.Rc5#
      • 1...Ra3
        • 2.Rc5#
      • 1...Bg3
        • 2.Rc5#
      • 1...Be5
        • 2.Rg2#
      • 1...Kg5!
    • 1.Rg2+?
      • 1...Re4
        • 2.Bxe4#
        • 2.fxe4#
      • 1...Rxb1!
  • Keys
    • 1.f4!
      • threat
        • 2.Sg3#
      • 1...Ke4
        • 2.Re2#
      • 1...Rxf4
        • 2.Rg2#
      • 1...Bxf4
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • R(a);SBLOCK::S(I)
    • B(e);SBLOCK,S_CUTR(a)::S(I)
    • B(e);N_GUARD::QAR2(J)
  • Tries
    • Try
      • B(E);XR(a)
      • Threat
        • DUALS(2)
      • Vars
        • R(d);::B(A)+R(D),DCHECK
        • B(e);::B(A)+R(D),DCHECK
        • B(e);::B(A)+R(D)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(D);CHECK
      • Refutation
        • R(a);XB(A)
  • Actual
    • P(F);
    • Threat
      • S(C)
    • Vars
      • K(b);S_FLIGHT::B(A)+R(D),DCHECK
      • R(a);N_GUARD,P_SPINR(a),XP(F)::B(A)+R(D)
      • B(e);N_GUARD,P_SPINB(e),XP(F)::QAR2(J)
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