MESON Chess Problem Database

Problem Display
PID: 272262 (K2b4/RNkP2Q1/3p3r/N4P2/3Bqp2/8/8/8 w - - 0 1)

Ellerman, Arnoldo

Die Schwalbe, 1932

K2b4/RNkP2Q1/3p3r/N4P2/3Bqp2/8/8/8

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb7+
      • 2.Rxb7#
    • 1...Bh4
      • 2.d8Q#
    • 1...Bg5
      • 2.d8Q#
    • 1...Bf6
      • 2.d8Q#
    • 1...Be7
      • 2.d8Q#
  • Keys
    • 1.Qf8!
      • threat
        • 2.Qxd8#
      • 1...Qxb7+
        • 2.Rxb7#
      • 1...Kxd7
        • 2.Qxd8#
      • 1...Qe7
        • 2.Sxd8#
      • 1...Qe8
        • 2.Sxd6#
      • 1...Rh8
        • 2.Qxd6#
      • 1...Bh4
        • 2.Qc8#
      • 1...Bg5
        • 2.Qc8#
      • 1...Bf6
        • 2.Qxd6#
        • 2.Qc8#
      • 1...Be7
        • 2.Qc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(a);CHECK,OGATE,P_SPINQ(a),XS(E)::R1(D),XQ(a)
    • B(f);OGATE::P=Q
  • Actual
    • Q(G);
    • Threat
      • QAB1(G),XB(f)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XS(E)::R1(D),XQ(a)
      • K(e);P-FLIGHT,XP(F)::QAR1(G),XB(f)
      • Q(a);N_PINS(E)::R(D)+S(E),XB(f)
      • Q(a);N_PINS(E)::R(D)+S(E),XP(c)
      • R(d);N_GUARD::QAB1(G),XP(c)
      • B(f);OGATE::QAR1(G)
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