MESON Chess Problem Database

Problem Display
PID: 15529 (3Q1rR1/3PN2p/3N1P2/1P2kp2/5R1K/B2P1pp1/Bp2nP2/b7 w - - 0 1)

Kopecny, P

1st Prize, Europe Echecs, 1985-1986

3Q1rR1/3PN2p/3N1P2/1P2kp2/5R1K/B2P1pp1/Bp2nP2/b7

#2

13 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf6
      • 2.Rxf5#
    • 1...Sxf4
      • 2.Sc6#
    • 1...h5
      • 2.Sg6#
    • 1...h6
      • 2.Sg6#
  • Tries
    • 1.Sf7+?
      • 1...Kxf4
        • 2.Sd5#
        • 2.Bd6#
        • 2.Qc7#
      • 1...Kxf6
        • 2.Rxf5#
        • 2.Qb6#
      • 1...Rxf7!
    • 1.Re4+?
      • 1...Kxf6
        • 2.Sd5#
        • 2.Re6#
        • 2.Qxf8#
      • 1...fxe4!
    • 1.Rg5?
      • threat
        • 2.Rgxf5#
      • 1...Kxf4
        • 2.Rxf5#
      • 1...Kxf6
        • 2.Rfxf5#
      • 1...Rxf6
        • 2.Re4#
      • 1...Sxf4
        • 2.Sc6#
      • 1...Sd4!
    • 1.Qc7?
      • threat
        • 2.Se8#
      • 1...Kxf4
        • 2.Sc4#
        • 2.Se4#
        • 2.Sdxf5#
        • 2.Sb7#
        • 2.Sf7#
        • 2.Sdc8#
        • 2.Se8#
      • 1...Kxf6
        • 2.Se4#
      • 1...Rxf6
        • 2.Sf7#
      • 1...Sxf4
        • 2.Qc3#
      • 1...Re8
        • 2.Sxe8#
      • 1...Rc8!
    • 1.d4+?
      • 1...Kxf4
        • 2.Sd5#
      • 1...Kxf6
        • 2.Se4#
        • 2.Rxf5#
        • 2.Qxf8#
      • 1...Sxd4!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Rxf5#
      • 1...Kxf4
        • 2.Qe3#
      • 1...Kxf6
        • 2.Sf7#
      • 1...Rxf6
        • 2.Qe3#
      • 1...Sxf4
        • 2.Sc4#
      • 1...Sd4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • K(f);P_SPINP(g),S_FLIGHT,XP(I)::R1(E),XP(g)
    • S(c);SBLOCK,XR(E)::S(K)
    • P(h);N_GUARD::S(K)
  • Tries
    • Try
      • S(H);CHECK
      • Refutation
        • R(i);XS(H)
    • Try
      • R(E);CHECK
      • Refutation
        • P(g);XR(E)
    • Try
      • R(M);P_PINP(g)
      • Threat
        • R1(M),XP(g)
      • Vars
        • K(f);N_SPINP(g),S_FLIGHT,XR(E)::R1(M),XP(g)
        • K(f);S_FLIGHT,XP(I)::R1(E),XP(g)
        • R(i);SBLOCK,XP(I)::R1(E)
        • S(c);SBLOCK,XR(E)::S(K)
      • Refutation
        • S(c);
    • Try
      • Q(L);
      • Threat
        • QAB(L)+S(H)
      • Vars
        • K(f);P_SPINP(g),S_FLIGHT,XP(I)::S(H)
        • R(i);SBLOCK,XP(I)::QAB(L)+S(H),DCHECK
        • S(c);N_GUARD,SBLOCK,XR(E)::QAB(L)
        • R(i);::QAB(L)+S(H),XR(i)
      • Refutation
        • R(i);
    • Try
      • P(D);CHECK
      • Vars
        • K(f);S_FLIGHT,XR(E)::S(K)
      • Refutation
        • S(c);XP(D)
  • Actual
    • Q(L);
    • Threat
      • R1(E),XP(g)
    • Vars
      • K(f);S_FLIGHT,XR(E)::QAB1(L)
      • K(f);P_SPINP(g),S_FLIGHT,XP(I)::QAR(L)+S(H)
      • R(i);SBLOCK,XP(I)::QAR2(L)
      • S(c);SBLOCK,XR(E)::S(H)
      • S(c);N_GUARD::QAB1(L),XS(c)
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