MESON Chess Problem Database

Problem Display
PID: 593 (6nK/1pn1b1RN/4k1p1/3R4/4b3/3p1p2/Q6B/8 w - - 0 1)

Ellerman, Arnoldo

The Observer, 1967

6nK/1pn1b1RN/4k1p1/3R4/4b3/3p1p2/Q6B/8

#2

6 + 9

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Bf5
      • 2.Rd6#
    • 1...Bd6
      • 2.Re5#
    • 1...Bf6
      • 2.Sf8#
    • 1...Sf6
      • 2.Sg5#
  • Tries
    • 1.Sg5+?
      • 1...Kf6
        • 2.Rf7#
        • 2.Qa1#
        • 2.Qb2#
      • 1...Bxg5!
    • 1.Sf8+?
      • 1...Kf6
        • 2.Qa1#
        • 2.Qb2#
      • 1...Bxf8!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qxe4#
      • 1...Bxd5
        • 2.Qg4#
      • 1...Sxd5
        • 2.Qc8#
      • 1...Bf5
        • 2.Rd6#
      • 1...Bd6
        • 2.Re5#
      • 1...Bf6
        • 2.Sf8#
      • 1...Sf6
        • 2.Sg5#

Anticipated by 21004(1915)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(c);SBLOCK::QAB(A)+R(C),DCHECK
    • B(h);SBLOCK::QAB(A)+R(C),DCHECK
    • B(h);N_GUARD,P_PINR(D),SBLOCK::S(E)
    • S(i);SBLOCK,S_CUTB(h)::S(E)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • B(h);XS(E)
    • Try
      • S(E);CHECK
      • Refutation
        • B(h);XS(E)
  • Actual
    • Q(A);
    • Threat
      • QAR2(A),XB(c)
    • Vars
      • B(c);OGATE,P_SPINB(c),SBLOCK,XR(C)::QAB(A)
      • S(g);OGATE,P_SPINS(g),SBLOCK,XR(C)::QAB(A)
      • B(c);SBLOCK::QAB(A)+R(C),DCHECK
      • B(h);SBLOCK::QAB(A)+R(C),DCHECK
      • B(h);N_GUARD,P_PINR(D),SBLOCK::S(E)
      • S(i);SBLOCK,S_CUTB(h)::S(E)
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