MESON Chess Problem Database

Problem Display
PID: 10963 (3Qn2b/2p4R/K1B5/4kP2/8/5R2/p2Pn3/q7 w - - 0 1)

Laws, Benjamin Glover

International Chess Magazine, 1885

3Qn2b/2p4R/K1B5/4kP2/8/5R2/p2Pn3/q7

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Qe7#
    • 1...Bf6
      • 2.Qd5#
    • 1...Sc3
      • 2.d4#
    • 1...Sd6
      • 2.Qxh8#
    • 1...Sf6
      • 2.Re7#
  • Tries
    • 1.Rh4?
      • threat
        • 2.Re4#
        • 2.Qe7#
      • 1...Qd4
        • 2.Qe7#
      • 1...Qb1
        • 2.Qe7#
      • 1...Bf6
        • 2.Re4#
        • 2.Qd5#
      • 1...Sc3
        • 2.Qe7#
        • 2.Qd4#
        • 2.d4#
      • 1...Sg3
        • 2.Qe7#
      • 1...Sd4
        • 2.Re4#
      • 1...Sd6
        • 2.Qe7#
        • 2.Qxh8#
      • 1...Sf6
        • 2.Qxc7#
        • 2.Qe7#
      • 1...Sg7
        • 2.Re4#
      • 1...Sf4!
    • 1.d4+?
      • 1...Qxd4
        • 2.Qe7#
      • 1...Sxd4!
  • Keys
    • 1.Rf7!
      • threat
        • 2.Qd5#
      • 1...Sd6
        • 2.Qxh8#
      • 1...Qd4
        • 2.Qe7#
      • 1...Sc3
        • 2.d4#
      • 1...Sf4
        • 2.Re3#
      • 1...Sf6
        • 2.Re7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(a);SBLOCK::QAR2(G)
    • B(g);SBLOCK::QAR1(G)
    • S(c);N_GUARD,S_CUTQ(a)::P(A)
    • S(f);OGATE,SBLOCK::QAB(G),XB(g)
    • S(f);SBLOCK::R(F)
  • Tries
    • Try
      • R(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);::QAR2(G)
        • S(c);::QAR2(G)
        • S(c);::R1(F)
        • S(f);::R1(F)
      • Refutation
        • S(c);
    • Try
      • P(A);CHECK
      • Vars
        • Q(a);SBLOCK,XP(A)::QAR2(G)
      • Refutation
        • S(c);XP(A)
  • Actual
    • R(F);
    • Threat
      • QAR1(G)
    • Vars
      • S(f);OGATE,SBLOCK::QAB(G),XB(g)
      • Q(a);SBLOCK::QAR2(G)
      • S(c);N_GUARD,S_CUTQ(a)::P(A)
      • S(c);SBLOCK::R(B)
      • S(f);SBLOCK::R(F)
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