MESON Chess Problem Database

Problem Display
PID: 272418 (6b1/2p1Np2/1n1p1Q1K/N2Pn1p1/1P1k2P1/4r1R1/2BPp2B/4r3 w - - 0 1)

Swords, WJ

The Problemist, 1957

6b1/2p1Np2/1n1p1Q1K/N2Pn1p1/1P1k2P1/4r1R1/2BPp2B/4r3

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.dxc3#
    • 1...Re4
      • 2.Rd3#
    • 1...Sc4
      • 2.Sac6#
    • 1...Sxd5
      • 2.Sf5#
      • 2.Sec6#
  • Tries
    • 1.Bg1?
      • threat
        • 2.Bxe3#
      • 1...Sxd5
        • 2.Sf5#
        • 2.Sec6#
      • 1...Sc4
        • 2.Sb3#
        • 2.Sac6#
      • 1...Rxg1!
    • 1.Qf4+?
      • 1...Re4
        • 2.Qxe4#
      • 1...gxf4!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qxe3#
      • 1...Sxg4+
        • 2.Rxg4#
      • 1...Sxd5
        • 2.Sf5#
      • 1...Sec4
        • 2.Sac6#
      • 1...Sbc4
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(c);OGATE::P(B),XR(c)
    • R(c);OGATE,SBLOCK::R1(D)
    • S(g);SBLOCK::S(G)
  • Tries
    • Try
      • B(C);P_PINR(c)
      • Threat
        • B(C),XR(c)
      • Refutation
        • R(a);N_SPINR(c),XB(C)
    • Try
      • Q(I);CHECK,N_PINS(e)
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAR1(I),XR(c)
      • Refutation
        • P(f);XQ(I)
  • Actual
    • Q(I);N_PINS(e),P_PINR(c)
    • Threat
      • QAB1(I),XR(c)
    • Vars
      • S(e);CHECK,OGATE,XP(F)::R(D),XS(e)
      • S(g);SBLOCK,XP(H)::S(K)
      • S(e);N_GUARD,SBLOCK::S(G)
      • S(g);SBLOCK::S(G)
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