MESON Chess Problem Database

Problem Display
PID: 30512 (5B2/8/1N5N/4kB1n/3p4/6P1/1KP1P3/2Q5 w - - 0 1)

Elkhan, Alexander A

British Chess Magazine 13. Ty., 1906-1907

5B2/8/1N5N/4kB1n/3p4/6P1/1KP1P3/2Q5

#2

9 + 3

3360 Simple Two-move Themes 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Sd7#
    • 1...Sf6
      • 2.Qf4#
  • Tries
    • 1.Be7?
      • 1...d3
        • 2.Qe3#
      • 1...Sf4
        • 2.Qxf4#
        • 2.gxf4#
      • 1...Sf6
        • 2.Qf4#
      • 1...Sg7
        • 2.Qf4#
      • 1...Sxg3!
    • 1.Qe3+?
      • 1...Kf6
        • 2.Sd5#
        • 2.Sd7#
        • 2.Qe7#
      • 1...dxe3!
    • 1.Qf4+?
      • 1...Kf6
        • 2.Sd5#
        • 2.Sd7#
      • 1...Sxf4!
    • 1.Qg5?
      • threat
        • 2.Sg4#
        • 2.Sf7#
        • 2.Qe7#
      • 1...Sxg3
        • 2.Sg4#
        • 2.Sf7#
      • 1...Sf4
        • 2.Sg4#
        • 2.Sf7#
        • 2.Qg7#
        • 2.gxf4#
      • 1...Sf6
        • 2.Sf7#
        • 2.Qf4#
      • 1...Sg7
        • 2.Sg4#
        • 2.Sf7#
        • 2.Qxg7#
      • 1...d3!
  • Keys
    • 1.c4!
      • threat
        • 2.Sd7#
      • 1...dxc4 ep+
        • 2.Qxc3#
      • 1...Kf6
        • 2.Sd7#
      • 1...d3
        • 2.Qc3#
      • 1...Sf6
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::S(G)
    • S(c);N_GUARD,SBLOCK::QAB1(A)
  • Tries
    • Try
      • B(I);
      • Vars
        • P(a);N_GUARD::QAR2(A)
        • S(c);N_GUARD::QAB1(A)
      • Refutation
        • S(c);XP(E)
    • Try
      • Q(A);CHECK
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • S(c);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Refutation
        • P(a);
  • Actual
    • P(C);
    • Threat
      • S(G)
    • Vars
      • P(a);CHECK,EP,OGATEB,XP(C)::QAB(A),XP(a)
      • K(b);S_FLIGHT::S(G)
      • P(a);OGATEB::QAB(A)
      • S(c);N_GUARD,SBLOCK::QAB1(A)
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