MESON Chess Problem Database

Problem Display
PID: 90144 (3n4/p1rRq2p/3P1p2/1B1k1P2/Nb1B1Q1K/2p5/4P3/8 w - - 0 1)

Ursprung, Karl

Die Schwalbe, 1975

3n4/p1rRq2p/3P1p2/1B1k1P2/Nb1B1Q1K/2p5/4P3/8

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.dxe7#
    • 1...Bc5
      • 2.Sxc3#
    • 1...a5
      • 2.Sb6#
    • 1...a6
      • 2.Sb6#
  • Tries
    • 1.dxe7+?
      • 1...Bd6
        • 2.Rxd6#
      • 1...Rxd7!
  • Keys
    • 1.Bc5!
      • threat
        • 2.Qd4#
      • 1...Rxc5
        • 2.dxe7#
      • 1...Bxc5
        • 2.Sxc3#
      • 1...Qe4
        • 2.dxc7#
      • 1...Qe3
        • 2.dxc7#
      • 1...Qe5
        • 2.Qc4#
      • 1...Sc6
        • 2.Bc4#
      • 1...Se6
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(f);N_GUARD,S_CUTB(b)::R(I)+P(H),XQ(g)
    • B(b);N_GUARD,S_CUTR(f)::S(B),XP(a)
    • P(e);N_GUARD::S(B)
  • Tries
    • Try
      • P(H);CHECK,XQ(g)
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::R1(I),XB(b)
      • Refutation
        • R(f);XR(I)
  • Actual
    • B(C);
    • Threat
      • QAR1(D)
    • Vars
      • R(f);N_GUARD,XB(C)::R(I)+P(H),XQ(g)
      • B(b);N_GUARD,SBLOCK,XB(C)::S(B),XP(a)
      • Q(g);N_GUARD,P_PINQ(D)::R(I)+P(H),XR(f)
      • Q(g);N_GUARD::R(I)+P(H),XR(f)
      • Q(g);SBLOCK::QAB1(D)
      • S(i);SBLOCK::B(F)
      • S(i);S_CUTQ(g)::P(A)
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