MESON Chess Problem Database

Problem Display
PID: 101640 (qbR5/8/B1b3Qn/1n1kB2R/r3Np2/PN6/2P5/7K w - - 0 1)

Larrain, Santiago

1st HM., Boletim da UBP, 1984-1985

qbR5/8/B1b3Qn/1n1kB2R/r3Np2/PN6/2P5/7K

#2

10 + 8

1077 Boletim da UBP 1988
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qe6#
    • 1...Qa7
      • 2.Qxc6#
    • 1...Bb7
      • 2.Rc5#
    • 1...Bd7
      • 2.Rc5#
    • 1...Be8
      • 2.Rc5#
    • 1...Sxa3
      • 2.Sc3#
    • 1...Sc3
      • 2.Sxc3#
    • 1...Sd4
      • 2.Sc3#
    • 1...Sd6
      • 2.Sc3#
    • 1...Sa7
      • 2.Sc3#
    • 1...Sc7
      • 2.Sc3#
  • Tries
    • 1.Sc3+?
      • 1...Kc4+
        • 2.Qe4#
      • 1...Sxc3!
    • 1.Sf6+?
      • 1...Kc4+
        • 2.Qe4#
      • 1...Ke6+!
    • 1.Bd6+?
      • 1...Kc4
        • 2.Bxb5#
        • 2.Rc5#
        • 2.Qe6#
      • 1...Sf5!
    • 1.Bc7+?
      • 1...Kc4
        • 2.Rc5#
      • 1...Sf5!
    • 1.Bxb8+?
      • 1...Kc4
        • 2.Bxb5#
        • 2.Rc5#
        • 2.Qe6#
      • 1...Sf5!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Qe6#
      • 1...Kc4+
        • 2.Qe4#
      • 1...Kxe5+
        • 2.Sf3#
      • 1...Bd7
        • 2.Rc5#
      • 1...Sd4
        • 2.Qe4#
      • 1...Sc7
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • K(d);P_PINS(E),P_SPINB(e),P_SPINS(c),S_FLIGHT::QAB(I)
    • Q(g);N_GUARD::QAB1(I),XB(e)
    • B(e);OGATE::R1(J)
    • S(c);N_GUARD,XP(C)::S(E)
    • S(c);N_GUARD::S(E),XS(c)
    • S(c);N_GUARD::S(E)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(d);CHECK,P_SPINB(e),P_SPINS(c),S_FLIGHT::QAR2(I)
      • Refutation
        • S(c);XS(E)
    • Try
      • S(E);CHECK
      • Vars
        • K(d);CHECK,P_SPINB(e),P_SPINS(c),S_FLIGHT::QAR2(I)
      • Refutation
        • K(d);CHECK,S_FLIGHT
    • Try
      • B(F);CHECK
      • Refutation
        • S(f);P_SPINS(f)
    • Try
      • B(F);CHECK
      • Vars
        • K(d);OGATE,P_PINS(E),P_SPINS(c),S_FLIGHT::R1(G)
      • Refutation
        • S(f);P_SPINS(f)
    • Try
      • B(F);CHECK,XB(h)
      • Refutation
        • S(f);P_SPINS(f)
  • Actual
    • S(E);
    • Threat
      • QAB1(I)
    • Vars
      • K(d);CHECK,P_SPINB(e),P_SPINS(c),S_FLIGHT::QAR2(I)
      • K(d);CHECK,P-FLIGHT,XB(F)::R(G)+S(E),DCHECK
      • B(e);OGATE::R1(J)
      • S(c);S_CUTR(a)::QAB1(I)
      • S(c);N_GUARD,S_CUTB(h)::QAR1(I)
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