MESON Chess Problem Database

Problem Display
PID: 38474 (2nRK3/b4p2/1p1P1p2/3k1P2/2N2p2/4Qq2/2R1P2n/B6B w - - 0 1)

Laib, Kurt Friedrich

7th Comm., BCF 016. Ty., 1934-1935

2nRK3/b4p2/1p1P1p2/3k1P2/2N2p2/4Qq2/2R1P2n/B6B

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4+
      • 2.Bxe4#
    • 1...Sf1
      • 2.Bxf3#
    • 1...Sg4
      • 2.Bxf3#
    • 1...Sxd6+
      • 2.Rxd6#
  • Tries
    • 1.Sxb6+?
      • 1...Sxb6
        • 2.Rc5#
        • 2.Qd4#
        • 2.Qd3#
      • 1...Bxb6!
    • 1.Qd3+?
      • 1...Kc6
        • 2.Sa5#
      • 1...Kc5!
    • 1.Qe5+?
      • 1...Kc6
        • 2.Sa5#
      • 1...fxe5!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Sd2#
      • 1...Qe4+
        • 2.Se5#
      • 1...Sxd6+
        • 2.Sxd6#
      • 1...Ke4
        • 2.Qd3#
      • 1...Kc5
        • 2.Se3#
      • 1...Kc6
        • 2.Sa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(b);CHECK,OGATE::B(B),XQ(b)
    • S(a);N_GUARD::B(B),XQ(b)
    • S(i);CHECK,OGATE,P_SPINS(i),XP(H)::R1(I),XS(i)
  • Tries
    • Try
      • S(F);CHECK,XP(e)
      • Refutation
        • B(g);XS(F)
    • Try
      • Q(E);CHECK
      • Vars
        • K(d);S_FLIGHT::R(C)+S(F),DCHECK
      • Refutation
        • K(d);N_SPINQ(b),P-FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(d);S_FLIGHT::R(C)+S(F),DCHECK
      • Refutation
        • P(f);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAB(E)+S(F)
    • Vars
      • Q(b);CHECK::QAB(E)+S(F)
      • S(i);CHECK,P_SPINS(i),XP(H)::QAB(E)+S(F),XS(i)
      • K(d);S_FLIGHT::QAB1(E)
      • K(d);N_SPINQ(b),P-FLIGHT::R(C)+S(F)
      • K(d);S_FLIGHT::R(C)+S(F),DCHECK
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