MESON Chess Problem Database

Problem Display
PID: 53158 (3Q4/4pR2/8/3pNP1N/4k2n/2Bp4/3P2R1/K2b4 w - - 0 1)

Collins, Francis Charles

English Mechanic and World of Science, 1881

(First published on Fri Nov 11 1881)

3Q4/4pR2/8/3pNP1N/4k2n/2Bp4/3P2R1/K2b4

#2

9 + 6

15 British Chess Magazine 1881
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bc2
      • 2.Rg4#
    • 1...Bb3
      • 2.Rg4#
    • 1...Ba4
      • 2.Rg4#
    • 1...Bg4
      • 2.Rxg4#
    • 1...Sf3
      • 2.Rg4#
    • 1...d4
      • 2.Qxd4#
  • Tries
    • 1.Qb6?
      • threat
        • 2.Qe3#
        • 2.Qd4#
      • 1...Sxg2
        • 2.Qd4#
      • 1...d4
        • 2.Qxd4#
      • 1...Sf3
        • 2.Rg4#
        • 2.Qe3#
      • 1...Sxf5!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Sg5#
      • 1...Kxf3
        • 2.Qxd5#
      • 1...Bxf3
        • 2.Qxe7#
      • 1...Sxf3
        • 2.Rg4#
      • 1...d4
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • B(a);N_GUARD::R(C)
    • B(a);N_GUARD::R(C),XB(a)
    • S(d);S_CUTB(a)::R(C)
    • P(e);OGATE::QAR1(I),XP(e)
  • Tries
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • S(d);XR(C)::QAR1(I)
        • P(e);::QAR1(I),XP(e)
      • Refutation
        • S(d);XP(F)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • K(c);S_FLIGHT,XS(E)::QAB(I),XP(e)
      • B(a);SBLOCK,XS(E)::QAR(I),XP(f)
      • S(d);SBLOCK,XS(E)::R(C)
      • P(e);OGATEB::QAB(I)
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