MESON Chess Problem Database

Problem Display
PID: 118782 (7Q/8/1N1P2pK/2p5/p3k1B1/N2RP1P1/1n2RP2/Brbrn3 w - - 0 1)

Swane, Jan Arnold Willem

De Tijd, 1953

7Q/8/1N1P2pK/2p5/p3k1B1/N2RP1P1/1n2RP2/Brbrn3

#2

12 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd3
      • 2.Qe8#
    • 1...Bxe3+
      • 2.Rexe3#
      • 2.Rdxe3#
    • 1...Sexd3
      • 2.f3#
    • 1...Sbxd3
      • 2.Qa8#
    • 1...c4
      • 2.Qd4#
  • Tries
    • 1.Qa8+?
      • 1...Ke5
        • 2.Sd7#
      • 1...Kxd3!
    • 1.Qg8?
      • threat
        • 2.Qd5#
      • 1...Bxe3+
        • 2.Rexe3#
      • 1...Ke5
        • 2.Qe6#
      • 1...Rxd3
        • 2.Qe6#
        • 2.Qe8#
      • 1...Kxd3!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Sxc5#
      • 1...Bxe3+
        • 2.Rexe3#
      • 1...Kxd3
        • 2.Sxc5#
      • 1...Rxd3
        • 2.Qe5#
      • 1...Sexd3
        • 2.Qa8#
      • 1...Sbxd3
        • 2.Sf6#
      • 1...c4
        • 2.Sc5#
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(c);SBLOCK,XR(E)::QAR(L)
    • S(d);N_GUARD,SBLOCK,XR(E)::P(C)
    • S(e);SBLOCK,XR(E)::QAB(L)
    • P(h);N_GUARD::QAR1(L)
  • Tries
    • Try
      • Q(L);CHECK
      • Vars
        • K(g);P-FLIGHT,P_SPINS(e)::S(I)
      • Refutation
        • K(g);S_FLIGHT,XR(E)
    • Try
      • Q(L);
      • Threat
        • QAB1(L)
      • Vars
        • B(b);CHECK,OGATE,P_SPINB(b),XP(F)::R1(B),XB(b)
        • K(g);P-FLIGHT,P_SPINS(e)::QAR1(L)
      • Refutation
        • K(g);S_FLIGHT,XR(E)
  • Actual
    • S(I);
    • Threat
      • S(I),XP(h)
    • Vars
      • B(b);CHECK,OGATE,P_SPINB(b),XP(F)::R1(B),XB(b)
      • K(g);S_FLIGHT,XR(E)::S(I),XP(h)
      • R(c);SBLOCK,XR(E)::QAR1(L)
      • S(d);SBLOCK,XR(E)::QAB(L)
      • S(e);SBLOCK,XR(E)::S(I)
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