MESON Chess Problem Database

Problem Display
PID: 258365 (8/8/7p/7K/3ppN1B/5k2/4N2p/4Q2n w - - 0 1)

Billington, Thomas Henry

English Mechanic and World of Science, 1891

(First published on Fri Oct 30 1891)

8/8/7p/7K/3ppN1B/5k2/4N2p/4Q2n

#2

5 + 6

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Qxf2#
    • 1...Sg3+
      • 2.Qxg3#
    • 1...e3
      • 2.Qxh1#
  • Tries
    • 1.Qc1?
      • threat
        • 2.Sxd4#
      • 1...e3
        • 2.Qxh1#
        • 2.Qc6#
      • 1...d3
        • 2.Sd4#
      • 1...Sg3+!
    • 1.Qf1+?
      • 1...Sf2
        • 2.Qxf2#
      • 1...Ke3!
  • Keys
    • 1.Bg3!
      • threat
        • 2.Sxd4#
      • 1...Sxg3+
        • 2.Qxg3#
      • 1...Ke3
        • 2.Sg1#
      • 1...Sf2
        • 2.Qxf2#
      • 1...d3
        • 2.Sd4#
      • 1...e3
        • 2.Qxh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(A),XS(a)
    • S(a);CHECK,N_GUARD::QAR1(A),XS(a)
    • P(e);SBLOCK::QAB(A),XS(a)
  • Tries
    • Try
      • Q(A);
      • Threat
        • S(B),XP(d)
      • Vars
        • P(d);::S(B)
      • Refutation
        • S(a);CHECK
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR1(A),XS(a)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • B(D);
    • Threat
      • S(B),XP(d)
    • Vars
      • S(a);CHECK,OGATE,XB(D)::QAR1(A),XS(a)
      • K(c);P-FLIGHT,S_CUTP(b),S_CUTP(b),S_CUTP(b),S_CUTP(b)::QAR(A)+S(B)
      • S(a);N_GUARD::QAR1(A),XS(a)
      • P(d);::S(B)
      • P(e);SBLOCK::QAB(A),XS(a)
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