MESON Chess Problem Database

Problem Display
PID: 242971 (4K2B/Q3N1R1/2pR4/2Pn1p2/3k4/1P3BP1/1PP2pP1/4r3 w - - 0 1)

Kolodnas, Zelikas

Die Schwalbe, 1929

4K2B/Q3N1R1/2pR4/2Pn1p2/3k4/1P3BP1/1PP2pP1/4r3

#2

13 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Sxc6#
    • 1...Re3
      • 2.Rg4#
    • 1...Rxe7+
      • 2.Rxe7#
  • Tries
    • 1.Rxd5+?
      • 1...Ke3
        • 2.Sxf5#
        • 2.Rd3#
      • 1...cxd5!
    • 1.Qa4+?
      • 1...Kxc5
        • 2.Rxc6#
      • 1...Ke5
        • 2.Sxc6#
        • 2.Sg6#
      • 1...Ke3!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qc3#
      • 1...Rxe7+
        • 2.Rxe7#
      • 1...Ke3
        • 2.Sxf5#
      • 1...Ke5
        • 2.Sxc6#
      • 1...Re3
        • 2.Rg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(c);N_PINS(J),N_SPINS(d),S_FLIGHT::S(J),XP(f)
    • R(a);SBLOCK::B(M)+R(K),DCHECK
    • R(a);CHECK,OGATE,XS(J)::B(M)+R(K),XR(a)
  • Tries
    • Try
      • R(H);CHECK,XS(d)
      • Refutation
        • P(f);XR(H)
    • Try
      • Q(I);CHECK
      • Vars
        • K(c);N_SPINS(d),S_FLIGHT,XP(G)::R1(H),XP(f)
      • Refutation
        • K(c);N_PINS(J),N_SPINS(d),S_FLIGHT
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • R(a);CHECK,OGATE,XS(J)::B(M)+R(K),XR(a)
      • K(c);N_PINS(J),N_SPINS(d),S_FLIGHT::S(J),XP(e)
      • K(c);N_PINS(J),N_SPINS(d),S_FLIGHT::S(J),XP(f)
      • R(a);SBLOCK::B(M)+R(K),DCHECK
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