MESON Chess Problem Database

Problem Display
PID: 230689 (8/5K2/3p1p2/1R5N/1p2kPp1/1N2n1p1/QPp3P1/1nB2B2 w - - 0 1)

Alexander, Frederick Forrest Lawrie

The Globe, 1911

(First published on Sat Mar 18 1911)

8/5K2/3p1p2/1R5N/1p2kPp1/1N2n1p1/QPp3P1/1nB2B2

#2

10 + 9

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Sxg3#
      • 2.Sxf6#
    • 1...Sc4
      • 2.Sxg3#
      • 2.Sxf6#
    • 1...Sd5
      • 2.Sxg3#
    • 1...Sf5
      • 2.Sxf6#
  • Tries
    • 1.Sd2+?
      • 1...Kd4
        • 2.Qa7#
      • 1...Sxd2!
    • 1.Rxb4+?
      • 1...Kd5
        • 2.Qa8#
      • 1...Kf5
        • 2.Sxg3#
        • 2.Sg7#
        • 2.Bd3#
      • 1...Sc4!
    • 1.Qa8+?
      • 1...Sd5
        • 2.Sxg3#
        • 2.Qxd5#
      • 1...d5!
  • Keys
    • 1.Rd5!
      • 1...Kxd5
        • 2.Qa8#
      • 1...Sxf1
        • 2.Sxf6#
      • 1...Sxg2
        • 2.Bxg2#
      • 1...Sxd5
        • 2.Sxg3#
      • 1...Sd2
        • 2.Sxd2#
      • 1...Sa3
        • 2.Sd2#
      • 1...Sc3
        • 2.Sd2#
      • 1...Sd1
        • 2.Sxf6#
      • 1...Sc4
        • 2.Sxf6#
      • 1...Sf5
        • 2.Sxf6#
      • 1...f5
        • 2.Rd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • S(c);::S(I),XP(d)
    • S(c);::S(I),XP(i)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(f);P-FLIGHT::QAB(C)
      • Refutation
        • S(a);XS(F)
    • Try
      • R(H);CHECK,XP(e)
      • Vars
        • K(f);S_FLIGHT::QAB(C)
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • Q(C);CHECK
      • Refutation
        • P(h);P_SPINP(h)
  • Actual
    • R(H);
    • Vars
      • K(f);OGATEB,S_FLIGHT,XR(H)::QAB(C)
      • S(c);XB(B)::S(I),XP(i)
      • S(c);OGATE,XP(E)::B(B),XS(c)
      • S(c);SBLOCK,XR(H)::S(I),XP(d)
      • S(a);N_GUARD::S(F),XS(a)
      • S(a);N_GUARD::S(F)
      • S(c);::S(I),XP(i)
      • P(i);SBLOCK::R1(H)
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