MESON Chess Problem Database

Problem Display
PID: 137886 (8/bR2Bp2/r2pkpb1/8/p2nB1Nq/4QP2/1p6/1K1R4 w - - 0 1)

Ellerman, Arnoldo

Natal Mercury, 1926

8/bR2Bp2/r2pkpb1/8/p2nB1Nq/4QP2/1p6/1K1R4

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4+
      • 2.Qxe4#
    • 1...Sf5
      • 2.Bd5#
    • 1...Sc6
      • 2.Rxd6#
    • 1...d5
      • 2.Bxg6#
    • 1...f5
      • 2.Bc6#
  • Tries
    • 1.Bc2+?
      • 1...Be4
        • 2.Qxe4#
      • 1...Kd5!
    • 1.Bd3+?
      • 1...Be4
        • 2.Qxe4#
      • 1...Kd5!
  • Keys
    • 1.Bf8!
      • threat
        • 2.Re7#
      • 1...Bxe4+
        • 2.Qxe4#
      • 1...Sf5
        • 2.Bd5#
      • 1...Sc6
        • 2.Rxd6#
      • 1...d5
        • 2.Bxg6#
      • 1...f5
        • 2.Bc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • B(i);CHECK,OGATE,P_SPINB(i),XB(E)::QAR2(C),XB(i)
    • S(c);N_PINB(E),SBLOCK::QAR(C)+B(E),DCHECK
    • S(c);::R1(B),XP(f)
    • P(f);SBLOCK::QAR(C)+B(E),XB(i)
    • P(h);N_PINB(E),SBLOCK::QAR(C)+B(E)
  • Tries
    • Try
      • B(E);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAR2(C),XB(i)
      • Refutation
        • K(g);P_SPINS(c),S_FLIGHT
    • Try
      • B(E);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAR2(C),XB(i)
      • Refutation
        • K(g);S_FLIGHT
  • Actual
    • B(H);
    • Threat
      • R1(G)
    • Vars
      • B(i);CHECK,OGATE,P_SPINB(i),XB(E)::QAR2(C),XB(i)
      • S(c);N_PINB(E),SBLOCK::QAR(C)+B(E),DCHECK
      • S(c);::R1(B),XP(f)
      • P(f);SBLOCK::QAR(C)+B(E),XB(i)
      • P(h);N_PINB(E),SBLOCK::QAR(C)+B(E)
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