MESON Chess Problem Database

Problem Display
PID: 52603 (Q1K1R3/3pPN2/2nP4/1N6/RP2k1P1/p7/B3P3/2B5 w - - 0 1)

Sonnenfeld, Felix Alexander

Sao Paulo Chess Club, 1957

Q1K1R3/3pPN2/2nP4/1N6/RP2k1P1/p7/B3P3/2B5

#2

13 + 4

5309 O Mosqueteiro do Rei 1997

SOLUTION

  • SOUND
  • Tries
    • 1.Be6?
      • 1...dxe6
        • 2.Qxc6#
      • 1...a2!
    • 1.Qa7?
      • threat
        • 2.Sc3#
        • 2.Qe3#
      • 1...Sxe7+
        • 2.Rxe7#
      • 1...Sd4
        • 2.Sc3#
        • 2.Qxd4#
      • 1...Sxa7+!
  • Keys
    • 1.Kb7!
      • 1...Sa5+
        • 2.bxa5#
      • 1...Sd8+
        • 2.exd8Q#
        • 2.exd8S#
        • 2.exd8B#
        • 2.exd8R#
      • 1...Sxb4
        • 2.Kb6#
        • 2.Ka7#
        • 2.Kc7#
        • 2.Kb8#
        • 2.Kc8#
        • 2.Rxb4#
      • 1...Sxe7
        • 2.Ka6#
        • 2.Kb6#
        • 2.Ka7#
        • 2.Kc7#
        • 2.Kb8#
        • 2.Rxe7#
      • 1...Sd4
        • 2.Sc3#
      • 1...Se5
        • 2.Sg5#
      • 1...Sa7
        • 2.Kxa7#
      • 1...Sb8
        • 2.Kxb8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(B);
      • Vars
        • P(d);N_GUARD,XB(B)::QAB(K),XS(c)
      • Refutation
        • P(a);
    • Try
      • Q(K);N_PINS(c)
      • Threat
        • DUALS(2)
      • Vars
        • S(c);CHECK,OGATE,P_SPINS(c),XP(I)::R(M),XS(c)
      • Refutation
        • S(c);CHECK,XQ(K)
  • Actual
    • K(L);N_PINS(c),S_FLIGHT
    • Vars
      • S(c);CHECK,OGATE::R(D)+P(E),XS(c)
      • S(c);SBLOCK::S(G)
      • S(c);SBLOCK::S(J)
      • S(c);::QAB(K)+K(L),XS(c)
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