MESON Chess Problem Database

Problem Display
PID: 90102 (K2n1BR1/ppPP1k1P/r6R/5B2/3b2Pq/7N/8/8 w - - 0 1)

Selb, Hans

Die Schwalbe, 1960

K2n1BR1/ppPP1k1P/r6R/5B2/3b2Pq/7N/8/8

#2

10 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Sg5#
      • 2.cxd8S#
    • 1...Qf2
      • 2.Sg5#
      • 2.cxd8S#
    • 1...Qg3
      • 2.Sg5#
      • 2.cxd8S#
    • 1...Qg5
      • 2.Sxg5#
    • 1...Qxh3
      • 2.cxd8S#
    • 1...Qxg4
      • 2.cxd8S#
    • 1...Qh5
      • 2.cxd8S#
    • 1...Rf6
      • 2.cxd8S#
    • 1...Sc6
      • 2.Be6#
  • Tries
    • 1.Rg7+?
      • 1...Kxf8
        • 2.h8Q#
      • 1...Bxg7!
  • Keys
    • 1.g5!
      • threat
        • 2.cxd8S#
      • 1...Qxg5
        • 2.Sxg5#
      • 1...Bb6
        • 2.Rf6#
      • 1...Bf6
        • 2.g6#
      • 1...Sc6
        • 2.Be6#
      • 1...Se6
        • 2.Bg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(b);N_GUARD::S(A),XQ(b)
    • Q(b);N_GUARD,XS(A)::PXS(g)=S
    • Q(b);N_GUARD,XP(B)::PXS(g)=S
    • Q(b);N_GUARD::PXS(g)=S
    • R(c);S_CUTQ(b)::PXS(g)=S
    • S(g);N_GUARD,S_CUTR(c)::B(C)
  • Tries
    • Try
      • R(J);CHECK
      • Vars
        • K(f);P-FLIGHT,XB(I)::P=Q
      • Refutation
        • B(a);XR(J)
  • Actual
    • P(B);
    • Threat
      • PXS(g)=S
    • Vars
      • Q(b);XP(B)::S(A),XQ(b)
      • B(a);N_GUARD,S_CUTR(c)::R1(D)
      • B(a);SBLOCK,S_CUTR(c)::P(B)
      • S(g);N_GUARD,S_CUTR(c)::B(C)
      • S(g);SBLOCK,S_CUTR(c)::B(C)
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