MESON Chess Problem Database

Problem Display
PID: 247718 (1Q5K/p1P5/2B2B2/r1k2n1R/pN2p1b1/2P2p2/3N1p1b/7n w - - 0 1)

Ellerman, Arnoldo

3rd Comm., Stratford Express, 1950

1Q5K/p1P5/2B2B2/r1k2n1R/pN2p1b1/2P2p2/3N1p1b/7n

#2

9 + 11

14867 BCPS Library 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.Be7#
    • 1...Bd6
      • 2.Bd4#
    • 1...Sg3
      • 2.Be7#
  • Tries
    • 1.Bb5?
      • threat
        • 2.Sxe4#
      • 1...Kd6
        • 2.c8Q#
      • 1...Sg3
        • 2.Be7#
        • 2.c8Q#
        • 2.c8R#
      • 1...e3
        • 2.Se4#
      • 1...Rxb5!
    • 1.Qf8+?
      • 1...Bd6
        • 2.Bd4#
      • 1...Kb6!
    • 1.c8S?
      • threat
        • 2.Bd4#
      • 1...Be5
        • 2.Qxe5#
      • 1...Bxh5!
  • Keys
    • 1.Bd5!
      • threat
        • 2.Sxe4#
      • 1...Kd6
        • 2.c8Q#
      • 1...Shg3
        • 2.c8Q#
        • 2.c8R#
      • 1...Sfg3
        • 2.Be7#
      • 1...Sd6
        • 2.Bd4#
      • 1...e3
        • 2.Se4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • B(c);N_GUARD::B(F)
    • B(c);SBLOCK::B(F)
    • S(a);S_CUTB(c)::B(F)
  • Tries
    • Try
      • B(E);
      • Threat
        • S(A),XP(f)
      • Vars
        • K(i);N_SPINS(j),S_FLIGHT::P=Q
        • P(f);::S(A)
      • Refutation
        • R(h);XB(E)
    • Try
      • Q(H);CHECK
      • Vars
        • B(c);P_SPINB(c)::B(F)
      • Refutation
        • K(i);N_SPINS(j),S_FLIGHT
    • Try
      • P(G);
      • Threat
        • B(F)
      • Vars
        • B(c);N_GUARD,N_SPINS(j),P_PINB(F)::QAR2(H),XB(c)
      • Refutation
        • B(g);N_SPINS(j),XR(D)
  • Actual
    • B(E);N_PINS(j)
    • Threat
      • S(A),XP(f)
    • Vars
      • K(i);S_FLIGHT::P=Q
      • S(a);S_CUTB(c)::P=Q
      • S(j);N_GUARD,S_CUTB(c)::B(F)
      • S(j);N_GUARD,SBLOCK::B(F)
      • P(f);::S(A)
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