MESON Chess Problem Database

Problem Display
PID: 83786 (b7/p3p1Q1/r1P1RP2/PpNkB3/1K2N3/2P2r2/7b/8 w - - 0 1)

Ellerman, Arnoldo

Haring, Jacobus

Problemas, 1969

b7/p3p1Q1/r1P1RP2/PpNkB3/1K2N3/2P2r2/7b/8

#2

10 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc3
      • 2.Sxc3#
    • 1...exf6
      • 2.Qd7#
  • Tries
    • 1.Qg2?
      • threat
        • 2.Qa2#
      • 1...Rxc3
        • 2.Sxc3#
      • 1...Rf2
        • 2.Sxf2#
      • 1...Rxa5!
    • 1.Qg8?
      • threat
        • 2.Qd8#
      • 1...Bxe5
        • 2.Rd6#
      • 1...Bxc6
        • 2.Rxe7#
      • 1...Rxc6!
    • 1.fxe7?
      • threat
        • 2.Rd6#
      • 1...Bxe5
        • 2.Qxe5#
      • 1...Rf6
        • 2.Sxf6#
      • 1...Rxc6!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Bf4#
      • 1...Rxc3
        • 2.Sxc3#
      • 1...Rxf6
        • 2.Qd2#
      • 1...Bxe5
        • 2.Qxe5#
      • 1...exf6
        • 2.Rd6#
      • 1...Rg3
        • 2.Bxg3#
      • 1...Rf4
        • 2.Bxf4#
      • 1...Rf5
        • 2.Qd2#
      • 1...Bf4
        • 2.Bxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(b);XP(A)::S(C),XR(b)
    • P(g);OGATE,XP(I)::QAR2(J)
  • Tries
    • Try
      • Q(J);
      • Threat
        • QAB(J)
      • Vars
        • R(b);XP(A)::QAB(J)+S(C),DCHECK,XR(b)
        • R(b);::QAB(J)+S(C),XR(b)
      • Refutation
        • R(e);XP(D)
    • Try
      • Q(J);
      • Threat
        • QAR(J)
      • Vars
        • B(a);SBLOCK,XB(F)::QAB(J)+R(H),DCHECK
        • B(h);SBLOCK,XP(G)::QAB(J)+R(H),XP(g)
      • Refutation
        • R(e);XP(G)
    • Try
      • P(I);XP(g)
      • Threat
        • R1(H)
      • Vars
        • B(a);OGATE,XB(F)::QAR1(J),XB(a)
        • R(b);N_GUARD::S(C),XR(b)
      • Refutation
        • R(e);XP(G)
  • Actual
    • Q(J);
    • Threat
      • QAR(J)+B(F)
    • Vars
      • R(b);XP(A)::S(C),XR(b)
      • R(b);N_GUARD,XP(I)::QAR(J)
      • B(a);OGATE,P_SPINB(a),XB(F)::QAR1(J),XB(a)
      • P(g);N_GUARD,XP(I)::R1(H)
      • R(b);N_GUARD::QAR(J)+B(F),XR(b)
      • R(b);P_PINS(C)::QAR(J)+B(F),XR(b)
      • R(b);N_GUARD::QAR(J)
      • B(a);::QAR(J)+B(F),XB(a)
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