MESON Chess Problem Database

Problem Display
PID: 157361 (4RN1r/1n2pB1q/2pR1p2/4kP2/1P5p/3P4/5Q2/K4n2 w - - 0 1)

Kovacevic, Marjan

4th Prize, The Macedonian Problemist, 2009

4RN1r/1n2pB1q/2pR1p2/4kP2/1P5p/3P4/5Q2/K4n2

#2

9 + 9

56 The Problemist 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf5
      • 2.Qd4#
    • 1...Sxd6
      • 2.Sd7#
      • 2.Rxe7#
    • 1...c5
      • 2.Rd5#
    • 1...e6
      • 2.Rexe6#
  • Tries
    • 1.Se6?
      • threat
        • 2.Qf4#
      • 1...Kxd6
        • 2.Qd4#
      • 1...Qxf5
        • 2.Qd4#
      • 1...Sxd6
        • 2.Qc5#
      • 1...exd6
        • 2.Sf8#
      • 1...Qh6!
    • 1.Rd4?
      • threat
        • 2.Sd7#
        • 2.Rxe7#
        • 2.Qf4#
      • 1...Qxf7
        • 2.Sd7#
        • 2.Qf4#
      • 1...Rxf8
        • 2.Rxe7#
        • 2.Qf4#
      • 1...Se3
        • 2.Qf4#
      • 1...Qh6
        • 2.Sd7#
        • 2.Rxe7#
      • 1...Sc5
        • 2.Qf4#
      • 1...Sd8
        • 2.Sd7#
        • 2.Qf4#
      • 1...e6
        • 2.Sd7#
        • 2.Rxe6#
        • 2.Qf4#
      • 1...Qxf5!
    • 1.Qe3+?
      • 1...Kxf5
        • 2.Be6#
      • 1...Kxd6
        • 2.Qxe7#
      • 1...Sxe3!
  • Keys
    • 1.Be6!
      • threat
        • 2.Qd4#
      • 1...Kxd6
        • 2.Qf4#
      • 1...Sxd6
        • 2.Sd7#
      • 1...exd6
        • 2.Bf7#
      • 1...Se3
        • 2.Qh2#
      • 1...c5
        • 2.Rd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(h);SBLOCK,XP(E)::QAB1(B)
    • P(d);N_GUARD::R1(F)
    • P(g);OGATE::R1(H),XP(g)
  • Tries
    • Try
      • S(I);N_PINP(g)
      • Threat
        • QAB1(B)
      • Vars
        • K(c);S_FLIGHT,XR(F)::QAR2(B)
        • Q(h);SBLOCK,XP(E)::QAB1(B)
        • S(f);N_GUARD,XR(F)::QAR2(B)
        • P(g);SBLOCK,XR(F)::R(H)+S(I)
      • Refutation
        • Q(h);
    • Try
      • R(F);
      • Threat
        • DUALS(3)
      • Vars
        • S(a);::QAB1(B)
        • S(f);::QAB1(B)
      • Refutation
        • Q(h);XP(E)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);N_SPINP(g),P-FLIGHT,XP(E)::B(G)
        • K(c);N_SPINP(g),OGATE,S_FLIGHT,XR(F)::QAB1(B),XP(g)
      • Refutation
        • S(a);XQ(B)
  • Actual
    • B(G);N_PINP(g)
    • Threat
      • QAB1(B)
    • Vars
      • K(c);S_FLIGHT,XR(F)::QAB(B)
      • S(f);SBLOCK,XR(F)::S(I)
      • P(g);OGATEB,SBLOCK,XR(F)::R(H)+B(G)
      • S(a);N_GUARD::QAB(B)
      • P(d);N_GUARD::R1(F)
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