MESON Chess Problem Database

Problem Display
PID: 21531 (1B2RR1q/K2B1n1r/3PN2n/4k3/1pp5/8/3Q1N2/1b6 w - - 0 1)

Ellerman, Arnoldo

2nd HM., Good Companions (November), 1919

1B2RR1q/K2B1n1r/3PN2n/4k3/1pp5/8/3Q1N2/1b6

#2

9 + 8

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qg5#
    • 1...Kf6
      • 2.Qg5#
    • 1...Bf5
      • 2.Qd4#
    • 1...Sg5
      • 2.Qd4#
    • 1...Sxd6
      • 2.Sg7#
      • 2.Bxd6#
      • 2.Qd4#
      • 2.Qxd6#
    • 1...Sd8
      • 2.Qd4#
  • Tries
    • 1.Qe3+?
      • 1...Kd5
        • 2.Sf4#
        • 2.Qc5#
      • 1...Kf5
        • 2.Qg5#
      • 1...Kf6
        • 2.Qg5#
      • 1...Be4!
    • 1.Qd5+?
      • 1...Kf6
        • 2.Qg5#
      • 1...Kxd5!
  • Keys
    • 1.Bc6!
      • threat
        • 2.Qf4#
      • 1...Sg5+
        • 2.d7#
      • 1...Sxd6+
        • 2.Sg7#
      • 1...Sd8+
        • 2.d7#
      • 1...Kf5
        • 2.Qg5#
      • 1...Kf6
        • 2.Qg5#
      • 1...Qf6
        • 2.Qd5#
      • 1...Bf5
        • 2.Qd4#
      • 1...Sf5
        • 2.Sg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(d);P-FLIGHT,P_SPINS(f)::QAR1(A)
    • K(d);P_SPINS(f),S_FLIGHT::QAB1(A)
    • B(a);SBLOCK::QAB1(A)
    • S(f);P_PINB(F)::QAB1(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);P-FLIGHT,P_SPINS(f)::QAR1(A)
        • K(d);P_SPINS(f),S_FLIGHT::QAB1(A)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);OGATE,P_SPINS(f),S_FLIGHT::QAB1(A)
      • Refutation
        • K(d);P-FLIGHT,XQ(A)
  • Actual
    • B(F);
    • Threat
      • QAB1(A)
    • Vars
      • S(f);CHECK,N_GUARD::B(G)+P(C)
      • S(f);CHECK,P_SPINS(f),XP(C)::R(H)+S(D)
      • K(d);P-FLIGHT,P_SPINS(f)::QAR1(A)
      • K(d);P_SPINS(f),S_FLIGHT::QAB1(A)
      • Q(h);SBLOCK::QAR1(A)
      • B(a);SBLOCK::QAB1(A)
      • S(e);N_GUARD,SBLOCK::S(B)
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