MESON Chess Problem Database

Problem Display
PID: 118917 (3Q4/2B4K/7p/r2PnP1r/1P1pkp2/8/2n1BPP1/1N1R4 w - - 0 1)

Valuska, Jan

1st HM., Boletim da UBP, 1969

3Q4/2B4K/7p/r2PnP1r/1P1pkp2/8/2n1BPP1/1N1R4

#2

11 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf5
      • 2.Sd2#
    • 1...Sd3
      • 2.Bxd3#
    • 1...Sf3
      • 2.Bd3#
    • 1...Sc4
      • 2.Bd3#
    • 1...Sg4
      • 2.Bd3#
    • 1...Sc6
      • 2.Bd3#
    • 1...Sg6
      • 2.Bd3#
    • 1...Sf7
      • 2.Bd3#
  • Tries
    • 1.Qf6?
      • threat
        • 2.Qxe5#
      • 1...Kxd5
        • 2.Sc3#
      • 1...Rxd5
        • 2.Sd2#
      • 1...Sd3
        • 2.Bf3#
      • 1...Sf3
        • 2.Bxf3#
      • 1...Sc4
        • 2.Bf3#
      • 1...Sg4
        • 2.Bf3#
      • 1...Sc6
        • 2.Bf3#
      • 1...Sg6
        • 2.Bf3#
      • 1...Sd7
        • 2.Bf3#
      • 1...Sf7
        • 2.Bf3#
      • 1...Rxf5!
    • 1.Qe7?
      • threat
        • 2.Qxe5#
      • 1...Kxf5
        • 2.Qxe5#
      • 1...Rxd5
        • 2.Bd3#
      • 1...Rxf5
        • 2.Bf3#
      • 1...Kxd5!
    • 1.Qd6?
      • threat
        • 2.Qxe5#
      • 1...Kxf5
        • 2.Qxe5#
      • 1...Rxf5
        • 2.Sd2#
      • 1...Sd3
        • 2.Bxd3#
      • 1...Sf3
        • 2.Bd3#
      • 1...Sc4
        • 2.Bd3#
      • 1...Sg4
        • 2.Bd3#
      • 1...Sc6
        • 2.Bd3#
      • 1...Sg6
        • 2.Bd3#
      • 1...Sd7
        • 2.Bd3#
      • 1...Sf7
        • 2.Bd3#
      • 1...Rxd5!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qxe5#
      • 1...Kxd5
        • 2.Sc3#
      • 1...Kxf5
        • 2.Qxe5#
      • 1...Rxd5
        • 2.Bd3#
      • 1...Rxf5
        • 2.Bf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • R(g);SBLOCK,XP(H)::S(A)
    • S(f);N_GUARD::B(C),XS(f)
    • S(f);N_GUARD::B(C)
  • Tries
    • Try
      • Q(K);
      • Threat
        • QAR1(K),XS(f)
      • Vars
        • K(c);P_SPINP(b),S_FLIGHT,XP(G)::S(A)
        • R(e);SBLOCK,XP(G)::S(A)
        • S(f);N_GUARD::B(C)
        • S(f);N_GUARD::B(C),XS(f)
      • Refutation
        • R(g);XP(H)
    • Try
      • Q(K);P_PINS(f)
      • Threat
        • QAR1(K),XS(f)
      • Vars
        • K(c);N_SPINS(f),S_FLIGHT,XP(H)::QAR1(K),XS(f)
        • R(e);SBLOCK,XP(G)::B(C)
        • R(g);SBLOCK,XP(H)::B(C)
      • Refutation
        • K(c);N_SPINS(f),P_SPINP(b),S_FLIGHT,XP(G)
    • Try
      • Q(K);
      • Threat
        • QAR1(K),XS(f)
      • Vars
        • K(c);S_FLIGHT,XP(H)::QAR1(K),XS(f)
        • R(g);SBLOCK,XP(H)::S(A)
        • S(f);N_GUARD::B(C),XS(f)
        • S(f);N_GUARD::B(C)
      • Refutation
        • R(e);XP(G)
  • Actual
    • Q(K);P_PINS(f)
    • Threat
      • QAR1(K),XS(f)
    • Vars
      • K(c);N_SPINS(f),P_SPINP(b),S_FLIGHT,XP(G)::S(A)
      • K(c);N_SPINS(f),S_FLIGHT,XP(H)::QAR1(K),XS(f)
      • R(e);SBLOCK,XP(G)::B(C)
      • R(g);SBLOCK,XP(H)::B(C)
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