MESON Chess Problem Database

Problem Display
PID: 259019 (7Q/1n1RpB2/1PrPP1K1/nRBkN3/5P2/1p1P1p2/1P3N2/8 w - - 0 1)

Alexander, Frederick Forrest Lawrie

Western Morning News, 1922

(First published on Sat Nov 11 1922)

7Q/1n1RpB2/1PrPP1K1/nRBkN3/5P2/1p1P1p2/1P3N2/8

#2

14 + 7

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4
      • 2.dxc4#
    • 1...exd6
      • 2.e7#
  • Tries
    • 1.Qh5?
      • threat
        • 2.Sxf3#
        • 2.Sc4#
        • 2.Seg4#
        • 2.Qxf3#
      • 1...Rxb6
        • 2.Qxf3#
      • 1...Rxd6
        • 2.Qxf3#
      • 1...Sxc5
        • 2.Sxf3#
      • 1...Rc7
        • 2.Qxf3#
      • 1...Rc8
        • 2.Qxf3#
      • 1...Sc4
        • 2.Sxc4#
        • 2.Qxf3#
        • 2.dxc4#
      • 1...Rxc5!
  • Keys
    • 1.Qa8!
      • 1...Rxc5
        • 2.dxe7#
      • 1...Rxb6
        • 2.Bxb6#
      • 1...Rxd6
        • 2.Be3#
      • 1...Sxc5
        • 2.dxe7#
      • 1...Sxd6
        • 2.Be3#
      • 1...exd6
        • 2.e7#
      • 1...Rc7
        • 2.dxc7#
      • 1...Rc8
        • 2.dxe7#
      • 1...Sc4
        • 2.dxc4#
      • 1...Sd8
        • 2.Be3#
        • 2.dxe7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • S(c);OGATE::P(C),XS(c)
    • P(g);OGATE,P_SPINP(g),XP(I)::B(M)+P(J)
  • Tries
    • Try
      • Q(N);
      • Threat
        • DUALS(4)
      • Vars
        • R(e);XP(H)::QAB(N),XP(b)
        • R(e);P_PINP(J),P_SPINR(e),XP(I)::QAB(N),XP(b)
        • S(f);P_SPINS(f),XB(F)::QAR(N)+S(G),XP(b)
        • R(e);::QAB(N),XP(b)
      • Refutation
        • R(e);P_SPINR(e),XB(F)
  • Actual
    • Q(N);
    • Vars
      • R(e);N_GUARD,P_SPINR(e),P_SPINS(f),XB(F)::R(L)+P(I),XP(g)
      • R(e);OGATE,P_SPINS(f),XP(H)::R(E)+B(F),XR(e)
      • R(e);N_GUARD,P_PINP(J),P_SPINR(e),P_SPINS(f),XP(I)::R(E)+B(F)
      • S(f);N_GUARD,P_SPINR(e),P_SPINS(f),XB(F)::R(L)+P(I),XP(g)
      • S(f);N_GUARD,P_SPINR(e),P_SPINS(f),XP(I)::R(E)+B(F)
      • P(g);OGATE,P_SPINP(g),XP(I)::B(M)+P(J)
      • R(e);OGATE,P_SPINS(f)::R(L)+P(I),XR(e)
      • R(e);N_GUARD,P_SPINS(f)::R(L)+P(I),XP(g)
      • S(c);OGATE::P(C),XS(c)
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