MESON Chess Problem Database

Problem Display
PID: 549 (7K/3p1Q1B/3r2P1/2B1N3/2Pnk1NR/5p2/2P1p1p1/b5q1 w - - 0 1)

Rice, John Michael

1st HM., The Observer, 1962

7K/3p1Q1B/3r2P1/2B1N3/2Pnk1NR/5p2/2P1p1p1/b5q1

#2

10 + 9

3174 The Two-move Chess Problem Tradition and Development 1966
5174 Chess Problem Spectrum 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc2
      • 2.Qxf3#
    • 1...Sb3
      • 2.Qxf3#
    • 1...Sb5
      • 2.Qxf3#
    • 1...Sc6
      • 2.Qxf3#
    • 1...Se6
      • 2.Qxf3#
      • 2.g7#
  • Tries
    • 1.Sf2+?
      • 1...Kxe5
        • 2.Sd3#
        • 2.Re4#
      • 1...Ke3!
    • 1.g7+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Rg6!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Qf4#
      • 1...Sxc2+
        • 2.Sge5#
      • 1...Sb3+
        • 2.Sge5#
      • 1...Sb5+
        • 2.Sge5#
      • 1...Sf5+
        • 2.Sf6#
      • 1...Sc6+
        • 2.Sge5#
      • 1...Se6+
        • 2.g7#
      • 1...Rf6
        • 2.Qd5#
      • 1...Qh2
        • 2.Sdf2#
      • 1...Qe3
        • 2.Sgf2#
      • 1...Qc1
        • 2.Sdf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(f);N_GUARD,P_PINS(F),XP(A)::QAB1(H),XP(e)
    • S(f);N_GUARD,P_PINS(F)::QAB1(H),XP(e)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(g);P-FLIGHT,P_SPINS(f)
    • Try
      • P(G);CHECK
      • Vars
        • S(f);N_GUARD,P_SPINS(f)::QAB1(H),XS(f)
      • Refutation
        • R(h);P_SPINR(h)
  • Actual
    • S(F);
    • Threat
      • QAR1(H)
    • Vars
      • S(f);CHECK,XP(A)::R(D)+S(C)
      • S(f);CHECK::R(D)+S(C)
      • S(f);CHECK,SBLOCK::R(D)+S(C),DCHECK
      • S(f);CHECK,N_GUARD,S_CUTR(h)::B(I)+P(G)
      • R(h);N_GUARD::QAB1(H)
      • Q(b);N_GUARD::S(F)
      • Q(b);SBLOCK::R(D)+S(C),DCHECK
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