MESON Chess Problem Database

Problem Display
PID: 63875 (1n3b2/1qr1P1RK/1P1k1P2/5Q2/bN2p2B/r7/8/8 w - - 0 1)

Ellerman, Arnoldo

Good Companions (January), 1918

1n3b2/1qr1P1RK/1P1k1P2/5Q2/bN2p2B/r7/8/8

#2

8 + 8

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Qxd5#
    • 1...Qa6
      • 2.Qd5#
    • 1...Qc8
      • 2.Qd5#
    • 1...Qxb6
      • 2.Qd5#
    • 1...Qa7
      • 2.Qd5#
    • 1...Ra1
      • 2.Bg3#
    • 1...Ra2
      • 2.Bg3#
    • 1...Rg3
      • 2.Bxg3#
    • 1...Rc6
      • 2.Qd5#
      • 2.e8S#
    • 1...Rd7
      • 2.e8S#
    • 1...Bd1
      • 2.e8S#
    • 1...Bc2
      • 2.e8S#
    • 1...Bb3
      • 2.Bg3#
      • 2.e8S#
    • 1...Bd7
      • 2.exf8Q#
      • 2.exf8B#
    • 1...Sc6
      • 2.Qd5#
      • 2.e8S#
    • 1...Sd7
      • 2.e8S#
    • 1...e3
      • 2.Bg3#
  • Tries
    • 1.Qe5+?
      • 1...Kd7
        • 2.exf8Q#
        • 2.exf8R#
        • 2.e8Q#
      • 1...Kxe5!
  • Keys
    • 1.Rg6!
      • threat
        • 2.f7#
      • 1...Rxe7+
        • 2.fxe7#
      • 1...Bxe7
        • 2.fxe7#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Qc8
        • 2.Qd5#
      • 1...Rg3
        • 2.Bxg3#
      • 1...Bb3
        • 2.Bg3#
      • 1...Bd7
        • 2.exf8Q#
        • 2.exf8B#
      • 1...Bg7
        • 2.fxg7#
      • 1...Sd7
        • 2.e8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • Q(e);N_GUARD::QAR1(C),XQ(e)
    • Q(e);N_GUARD::QAR1(C)
    • Q(e);N_GUARD,XP(D)::QAR1(C)
    • R(a);N_GUARD::B(B)
    • R(a);N_GUARD::B(B),XR(a)
    • R(f);S_CUTB(b)::P=S
    • B(b);N_GUARD::P=S
    • B(b);S_CUTR(f)::PXB(h)=Q
    • S(g);S_CUTB(b)::P=S
    • P(c);S_CUTR(a)::B(B)
  • Tries
    • Try
      • Q(C);CHECK
      • Refutation
        • K(d);S_FLIGHT,XQ(C)
  • Actual
    • R(G);P_SPINP(F)
    • Threat
      • R(G)+P(E)
    • Vars
      • R(f);CHECK,OGATE,XP(F)::R(G)+P(E),XR(f)
      • B(h);OGATE,XP(F)::R(G)+P(E),XB(h)
      • Q(e);N_GUARD::QAR1(C),XQ(e)
      • Q(e);N_GUARD::QAR1(C)
      • R(a);N_GUARD::B(B),XR(a)
      • B(b);S_CUTR(a)::B(B)
      • B(b);N_PINP(F)::PXB(h)=Q
      • B(h);N_PINP(F),OGATE::R(G)+P(E),XB(h)
      • S(g);N_PINP(F)::P=S
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