MESON Chess Problem Database

Problem Display
PID: 260690 (1BK5/QBRP3N/2N1Pp2/1p3p2/2Rbqk2/3P3P/5PP1/8 w - - 0 1)

Ellerman, Arnoldo

Lipton, Michael

American Chess Bulletin, 1958

1BK5/QBRP3N/2N1Pp2/1p3p2/2Rbqk2/3P3P/5PP1/8

#2

14 + 6

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc6
      • 2.R7xc6#
    • 1...Ba1
      • 2.Qe3#
    • 1...Bb2
      • 2.Qe3#
    • 1...Bxf2
      • 2.Qxf2#
    • 1...Bc3
      • 2.Qe3#
    • 1...Be3
      • 2.Qxe3#
    • 1...Be5
      • 2.Qe3#
  • Tries
    • 1.Rxd4?
      • 1...Qxd4
        • 2.Qxd4#
      • 1...b4!
    • 1.Qxd4?
      • threat
        • 2.Qe3#
        • 2.Qd6#
      • 1...Qxd4
        • 2.Rxd4#
      • 1...bxc4!
  • Keys
    • 1.Se7!
      • threat
        • 2.Sg6#
      • 1...Qxb7+
        • 2.Rxb7#
      • 1...Ke5
        • 2.R7c6#
      • 1...Qxg2
        • 2.R7c5#
      • 1...Bxf2
        • 2.R7c6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(b);OGATE,P_PINR(J),P_SPINB(a),XS(F)::B(M)+R(J),XQ(b)
    • B(a);OGATE,P_SPINQ(b)::QAB1(H)
    • B(a);OGATE,P_SPINQ(b),XP(A)::QAR2(H),XB(a)
    • B(a);OGATE,P_SPINQ(b)::QAB1(H),XB(a)
  • Tries
    • Try
      • R(E);P_PINQ(b),XB(a)
      • Vars
        • Q(b);N_SPINQ(b),OGATE,XR(E)::QAR2(H),XQ(b)
      • Refutation
        • P(d);
    • Try
      • Q(H);P_PINQ(b),XB(a)
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);OGATE,XQ(H)::R(E),XQ(b)
      • Refutation
        • P(d);XR(E)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINB(a),XB(I)::B(M)+R(J),XQ(b)
      • K(c);S_CUTB(a),S_CUTQ(b),S_FLIGHT::B(M)+R(J)
      • Q(b);N_GUARD,P_SPINB(a),XP(B)::B(M)+R(J)
      • B(a);N_GUARD,P_SPINQ(b),XP(A)::B(M)+R(J)
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