MESON Chess Problem Database

Problem Display
PID: 229940 (rbbn4/k1P4R/rp6/1n2N3/8/5QK1/8/8 w - - 0 1)

Bottger, Horst

Freie Presse, 1969

rbbn4/k1P4R/rp6/1n2N3/8/5QK1/8/8

#2

5 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bh3
      • 2.c8S#
    • 1...Bg4
      • 2.c8S#
    • 1...Bf5
      • 2.c8S#
    • 1...Be6
      • 2.c8S#
    • 1...Bb7
      • 2.c8S#
    • 1...Bd7
      • 2.c8S#
    • 1...Sb7
      • 2.Sc6#
  • Tries
    • 1.Sc6+?
      • 1...Kb7
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Sxc6!
    • 1.cxd8S+?
      • 1...Bb7
        • 2.Sc6#
        • 2.Rxb7#
        • 2.Qxb7#
      • 1...Bd7
        • 2.Qb7#
      • 1...Sc7
        • 2.Sec6#
      • 1...Bc7!
  • Keys
    • 1.Qb7+!
      • 1...Kxb7
        • 2.cxd8S#
      • 1...Bxb7
        • 2.c8S#
      • 1...Sxb7
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • B(g);OGATE::P=S
    • S(h);N_GUARD,SBLOCK::S(C)
  • Tries
    • Try
      • S(C);CHECK,P_SPINP(D)
      • Vars
        • K(d);P-FLIGHT::PXB(f)=Q
      • Refutation
        • S(h);XS(C)
    • Try
      • P(D);CHECK,P_SPINS(C),XS(h)
      • Vars
        • B(g);N_GUARD,P_SPINB(g)::QAR1(A)
        • S(a);N_PINS(C),P_SPINS(a)::S(C)
      • Refutation
        • B(f);P_SPINB(f)
  • Actual
    • Q(A);CHECK
    • Vars
      • K(d);P-FLIGHT,XQ(A)::PXS(h)=S
      • B(g);OGATE,XQ(A)::P=S
      • S(h);SBLOCK,XQ(A)::S(C)
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