MESON Chess Problem Database

Problem Display
PID: 265105 (qn6/p2b2r1/2k1pQ2/B6R/4N3/2N2B2/5n2/1KR5 w - - 0 1)

Ravenscroft, G

Sunday Referee, 1936

(First published on Sun Sep 6 1936)

qn6/p2b2r1/2k1pQ2/B6R/4N3/2N2B2/5n2/1KR5

#2

8 + 8

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7+
      • 2.Sb5#
  • Tries
    • 1.Sd2+?
      • 1...Kd6
        • 2.Sc4#
      • 1...Se4!
    • 1.Sd6+?
      • 1...Se4
        • 2.Scxe4#
        • 2.Scb5#
      • 1...Kxd6!
    • 1.Qe5?
      • threat
        • 2.Sxf2#
        • 2.Qc7#
        • 2.Qb5#
      • 1...Qb7+
        • 2.Sb5#
      • 1...Sxe4
        • 2.Bxe4#
        • 2.Qc7#
      • 1...Bc8
        • 2.Qb5#
      • 1...Be8
        • 2.Qb5#
      • 1...Rg3
        • 2.Qc7#
        • 2.Qb5#
      • 1...Rg4
        • 2.Qc7#
        • 2.Qb5#
      • 1...Rg5
        • 2.Sxf2#
        • 2.Qc7#
      • 1...Rf7
        • 2.Qc7#
        • 2.Qb5#
      • 1...Sd1
        • 2.Sd2#
        • 2.Sf2#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sd6#
        • 2.Sf6#
        • 2.Qc7#
        • 2.Qb5#
      • 1...Sh1
        • 2.Sd2#
        • 2.Sf2#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sd6#
        • 2.Sf6#
        • 2.Qc7#
        • 2.Qb5#
      • 1...Sd3
        • 2.Sd2#
        • 2.Sf2#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sd6#
        • 2.Sf6#
        • 2.Qc7#
        • 2.Qb5#
      • 1...Sh3
        • 2.Sd2#
        • 2.Sf2#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sd6#
        • 2.Sf6#
        • 2.Qc7#
        • 2.Qb5#
      • 1...Sg4
        • 2.Sd2#
        • 2.Sf2#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sd6#
        • 2.Sf6#
        • 2.Qc7#
        • 2.Qb5#
      • 1...Sa6
        • 2.Sxf2#
        • 2.Qb5#
      • 1...a6
        • 2.Sxf2#
        • 2.Qc7#
      • 1...Kb7!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qc7#
      • 1...Qb7+
        • 2.Sb5#
      • 1...Kb7
        • 2.Sc5#
      • 1...Bc8
        • 2.Sxf2#
      • 1...Be8
        • 2.Sxf2#
      • 1...Sa6
        • 2.Qxa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(g);CHECK,SBLOCK::R(B)+S(C)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(b);P-FLIGHT,S_CUTS(a)::S(E)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • S(E);CHECK,N_PINP(c)
      • Refutation
        • K(b);P-FLIGHT,P_SPINP(c),XS(E)
    • Try
      • Q(H);N_PINP(c)
      • Threat
        • DUALS(3)
      • Vars
        • Q(g);CHECK,SBLOCK::R(B)+S(C)
        • B(e);::QAB1(H)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(H);N_PINP(c)
    • Threat
      • QAR1(H)
    • Vars
      • Q(g);CHECK,SBLOCK::R(B)+S(C)
      • K(b);N_GUARD,S_FLIGHT::B(D)+S(E),DCHECK
      • B(e);::B(D)+S(E),XS(a)
      • S(h);OGATE::QAB(H),XQ(g)
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