MESON Chess Problem Database

Problem Display
PID: 92213 (8/8/B3pK1Q/4p3/4k3/1pP1NR2/1r6/3b1N2 w - - 0 1)

Sonnenfeld, Felix Alexander

Schach Ecke, 1957

8/8/B3pK1Q/4p3/4k3/1pP1NR2/1r6/3b1N2

#2

7 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Sd2#
    • 1...Rd2
      • 2.Sxd2#
    • 1...Bc2
      • 2.Sd2#
    • 1...Bxf3
      • 2.Sg3#
  • Tries
    • 1.Rf2?
      • threat
        • 2.Sg3#
        • 2.Qg6#
        • 2.Qh7#
      • 1...Bf3
        • 2.Sg3#
      • 1...Bg4
        • 2.Sg3#
      • 1...Bh5
        • 2.Sg3#
      • 1...Rxf2+!
    • 1.Qh5?
      • threat
        • 2.Sg3#
        • 2.Qg4#
      • 1...Bxf3
        • 2.Qxe5#
      • 1...Rg2!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Qa8#
      • 1...Kxf3
        • 2.Kxe5#
      • 1...Bxf3
        • 2.Qb4#
      • 1...Rd2
        • 2.Sxd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(b);N_GUARD::S(A)
    • R(b);N_GUARD::S(A),XR(b)
    • B(a);S_CUTR(b)::S(A)
    • B(a);SBLOCK,XR(D)::S(A)
  • Tries
    • Try
      • R(D);
      • Threat
        • DUALS(3)
      • Vars
        • B(a);::S(A)
      • Refutation
        • R(b);CHECK,XR(D)
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);SBLOCK,XR(D)::QAR1(G),XP(e)
      • Refutation
        • R(b);
  • Actual
    • Q(G);
    • Threat
      • QAB(G)
    • Vars
      • K(d);S_FLIGHT,XR(D)::QAR(G)+K(F),XP(e)
      • B(a);SBLOCK,XR(D)::QAR(G)
      • R(b);N_GUARD::S(A),XR(b)
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