MESON Chess Problem Database

Problem Display
PID: 229606 (1Q4K1/r1R3b1/1pb3P1/1pk5/3RPP2/pp1p1N2/1P6/8 w - - 0 1)

Collins, Francis Charles

English Mechanic and World of Science, 1879

(First published on Mon Jan 20 1879)

1Q4K1/r1R3b1/1pb3P1/1pk5/3RPP2/pp1p1N2/1P6/8

#2

9 + 9

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bf8
      • 2.Qxf8#
    • 1...Bh8
      • 2.Qf8#
  • Tries
    • 1.Qd8?
      • threat
        • 2.Qe7#
        • 2.Qd5#
        • 2.Qd6#
      • 1...Rxc7
        • 2.Qd6#
      • 1...Bxd4
        • 2.Qxd4#
      • 1...b4
        • 2.Qd5#
      • 1...Be5
        • 2.Qd5#
      • 1...Bf6
        • 2.Qd5#
        • 2.Qd6#
      • 1...Bf8
        • 2.Qg5#
        • 2.Qd5#
        • 2.Qxf8#
      • 1...Ra8!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Sxb3#
      • 1...Kxd4
        • 2.Qxb6#
      • 1...Bxd4
        • 2.Qf8#
      • 1...b4
        • 2.Rd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(i);N_GUARD::QAB(H),XB(i)
    • B(i);N_GUARD::QAB(H)
  • Tries
    • Try
      • Q(H);
      • Threat
        • DUALS(3)
      • Vars
        • R(h);N_SPINB(g),XR(G)::QAB1(H)
        • B(i);OGATE,XR(C)::QAB1(H),XB(i)
        • P(d);::QAR1(H)
        • B(i);::QAR1(H)
      • Refutation
        • R(h);P_PINQ(H)
  • Actual
    • S(B);
    • Threat
      • S(B),XP(b)
    • Vars
      • K(e);N_SPINB(g),S_FLIGHT,XR(C)::QAB(H),XP(f)
      • B(i);N_GUARD,SBLOCK,XR(C)::QAB(H)
      • P(d);SBLOCK::R1(C)
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