MESON Chess Problem Database

Problem Display
PID: 43760 (3K4/3N2p1/p1pk1p2/1bp2PR1/r2r1N2/3p1B2/1Q5B/8 w - - 0 1)

Sheldon, Alfred King

De Problemist, 1930

3K4/3N2p1/p1pk1p2/1bp2PR1/r2r1N2/3p1B2/1Q5B/8

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Bc4
      • 2.Qb8#
    • 1...c4
      • 2.Qxd4#
  • Tries
    • 1.Be4?
      • threat
        • 2.Se2#
        • 2.Sg2#
        • 2.Sxd3#
        • 2.Sh3#
        • 2.Sd5#
        • 2.Sh5#
        • 2.Se6#
        • 2.Sg6#
      • 1...Rd5
        • 2.Sxd5#
      • 1...d2
        • 2.Se2#
        • 2.Sg2#
        • 2.Sd3#
        • 2.Sh3#
        • 2.Sd5#
        • 2.Sh5#
        • 2.Se6#
        • 2.Sg6#
      • 1...g6
        • 2.Se2#
        • 2.Sg2#
        • 2.Sxd3#
        • 2.Sh3#
        • 2.Sd5#
        • 2.Sh5#
        • 2.Se6#
        • 2.Sxg6#
      • 1...Rxe4!
    • 1.Qxd4+?
      • 1...cxd4
        • 2.Se2#
        • 2.Sg2#
        • 2.Sxd3#
        • 2.Sh3#
        • 2.Sd5#
        • 2.Sh5#
        • 2.Se6#
        • 2.Sg6#
      • 1...Rxd4!
  • Keys
    • 1.Se5!
      • threat
        • 2.Sf7#
      • 1...Kxe5+
        • 2.Sd5#
      • 1...fxe5
        • 2.Rg6#
      • 1...c4
        • 2.Qxd4#
      • 1...Bc4
        • 2.Qb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(d);OGATE::QAB(A)
    • P(e);N_GUARD,S_CUTR(b)::QAR2(A),XR(c)
  • Tries
    • Try
      • B(C);
      • Threat
        • DUALS(8)
      • Vars
        • R(c);::B(B)+S(D),XR(c)
      • Refutation
        • R(c);XB(C)
    • Try
      • Q(A);CHECK,XR(c)
      • Refutation
        • R(b);XQ(A)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(h);CHECK,P_SPINR(c),S_FLIGHT,XS(G)::B(B)+S(D)
      • P(i);OGATEB,SBLOCK,XS(G)::R(F)
      • P(e);N_GUARD,S_CUTR(b)::QAR2(A),XR(c)
      • B(d);OGATE::QAB(A)
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