MESON Chess Problem Database

Problem Display
PID: 279245 (QK2R3/2Np1p2/3Pbp2/PR1pqN2/4k1B1/6p1/3BP3/b3n3 w - - 0 1)

Boersma, Kornelis Thomas

Schakend Nederland, 1968

QK2R3/2Np1p2/3Pbp2/PR1pqN2/4k1B1/6p1/3BP3/b3n3

#2

11 + 10

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Qxd5#
    • 1...Qc3
      • 2.Qxd5#
    • 1...Qf4
      • 2.Qxd5#
    • 1...Bxf5
      • 2.Qxd5#
  • Tries
    • 1.Sxg3+?
      • 1...Qxg3
        • 2.Qxd5#
      • 1...Kd4!
    • 1.Rb4+?
      • 1...Qd4
        • 2.Qxd5#
      • 1...Bd4!
  • Keys
    • 1.Rxd5!
      • threat
        • 2.Rd4#
      • 1...Qb2+
        • 2.Rb5#
      • 1...Qxd6
        • 2.Sxd6#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...Qxf5
        • 2.Bxf5#
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Bxf5
        • 2.Rd3#
      • 1...Qc3
        • 2.Rc5#
      • 1...Qd4
        • 2.Sxg3#
      • 1...Qf4
        • 2.Rb5#
        • 2.Rc5#
      • 1...Bd4
        • 2.Rxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • Q(f);N_GUARD,P_PINR(E),P_SPINB(g)::QAB1(I),XP(e)
    • Q(f);N_GUARD,P_SPINB(g)::QAB1(I),XP(e)
    • B(g);N_GUARD,P_SPINQ(f),XS(F)::QAB1(I),XP(e)
  • Tries
    • Try
      • S(F);CHECK,XP(c)
      • Vars
        • Q(f);P_SPINB(g),XS(F)::QAB1(I),XP(e)
      • Refutation
        • K(d);N_SPINP(e),P-FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • Q(f);P_SPINB(g),P_SPINQ(f)::QAB1(I),XP(e)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • R(E);XP(e)
    • Threat
      • QAB(I)+R(E),DCHECK
    • Vars
      • Q(f);CHECK,N_GUARD,P_SPINB(g)::QAB(I)+R(E)
      • Q(f);P_PINS(H),P_SPINB(g),XP(G)::S(F),XQ(f)
      • Q(f);OGATE,P_SPINB(g),P_SPINQ(f),XR(E)::QAB1(I),XQ(f)
      • Q(f);OGATE,P_SPINB(g),XS(F)::B(C),XQ(f)
      • B(g);OGATE,P_SPINB(g),P_SPINQ(f),XR(E)::QAB1(I),XB(g)
      • B(g);N_GUARD,P_SPINQ(f),XS(F)::QAB(I)+R(E)
      • Q(f);N_GUARD,P_SPINB(g)::QAB(I)+R(E)
      • Q(f);N_GUARD,P_SPINB(g)::S(F),XP(c)
      • B(a);::QAB(I)+R(E),DCHECK,XB(a)
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