MESON Chess Problem Database

Problem Display
PID: 22720 (5r2/3N4/4P3/7B/2P2P2/R2Pk3/1Q1N2p1/5nK1 w - - 0 1)

Casa, Alex

4th Prize, The Problemist, 1995/II

5r2/3N4/4P3/7B/2P2P2/R2Pk3/1Q1N2p1/5nK1

#2

10 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf4
      • 2.Qe5#
    • 1...Rxf4
      • 2.d4#
  • Tries
    • 1.Sf3?
      • threat
        • 2.Qe5#
      • 1...Kxf4
        • 2.Qe5#
      • 1...Rxf4
        • 2.Qf2#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Sg3
        • 2.Qd2#
      • 1...Rf5!
    • 1.Se4?
      • threat
        • 2.Qf2#
      • 1...Kxf4
        • 2.Qf2#
      • 1...Rxf4
        • 2.Qb6#
      • 1...Sd2!
  • Keys
    • 1.Sb3!
      • threat
        • 2.Qd4#
      • 1...Kxd3
        • 2.Sd2#
      • 1...Kxf4
        • 2.Qe5#
      • 1...Rxf4
        • 2.Qe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(c);S_FLIGHT,XP(G)::QAB1(B)
    • R(d);SBLOCK,XP(G)::R(D)+P(E)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAR2(B)
      • Vars
        • K(c);S_FLIGHT,XP(G)::QAB1(B)
        • R(d);SBLOCK,XP(G)::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
        • S(a);N_GUARD::QAB1(B)
      • Refutation
        • R(d);
    • Try
      • S(C);
      • Threat
        • QAB1(B)
      • Vars
        • K(c);S_FLIGHT,XP(G)::QAR2(B)
        • R(d);SBLOCK,XP(G)::QAB(B)
      • Refutation
        • S(a);
  • Actual
    • S(C);
    • Threat
      • QAB1(B)
    • Vars
      • K(c);P-FLIGHT,XP(E)::R(D)+S(C)
      • K(c);S_FLIGHT,XP(G)::QAB1(B)
      • R(d);SBLOCK,XP(G)::QAR1(B)
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