MESON Chess Problem Database

Problem Display
PID: 38161 (7B/Pp1p4/8/4Pp1p/p1B5/3N2n1/1P1NP3/k3K2R w K - 0 1)

Sonnenfeld, Felix Alexander

1st Prize, O Globo, 1966

7B/Pp1p4/8/4Pp1p/p1B5/3N2n1/1P1NP3/k3K2R

#2

10 + 7

3772 FIDE Album (1965-1967) 1976
1077 Boletim da UBP 1989

SOLUTION

  • SOUND
  • Sets
    • 1...Sxe2
      • 2.Kxe2#
    • 1...Se4
      • 2.0-0#
  • Tries
    • 1.Kf2+?
      • 1...Sf1
        • 2.Rxf1#
      • 1...Sxh1+!
    • 1.a8Q?
      • threat
        • 2.Qxa4#
      • 1...a3
        • 2.Qxa3#
      • 1...b5!
    • 1.a8R?
      • threat
        • 2.Rxa4#
      • 1...a3
        • 2.Rxa3#
      • 1...b5!
  • Keys
    • 1.b4!
      • threat
        • 2.e6#
      • 1...Sxe2
        • 2.Kxe2#
      • 1...axb4 ep
        • 2.a8Q#
        • 2.a8R#
      • 1...Se4
        • 2.0-0#
      • 1...d5
        • 2.exd5 ep#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(b);XP(E)::R(B)+K(A),XS(b)
    • S(b);::0-0
  • Tries
    • Try
      • K(A);CHECK,S_FLIGHT
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::R(B),XS(b)
      • Refutation
        • S(b);CHECK,XR(B)
    • Try
      • P(I);P_PINP(c)
      • Threat
        • QAR(I),XP(c)
      • Vars
        • P(c);OGATE::QAR2(I),XP(c)
      • Refutation
        • P(f);
    • Try
      • P(I);P_PINP(c)
      • Threat
        • R(I),XP(c)
      • Vars
        • P(c);OGATE::R(I),XP(c)
      • Refutation
        • P(f);
  • Actual
    • P(C);
    • Threat
      • B(J)+P(H)
    • Vars
      • S(b);XP(E)::R(B)+K(A),XS(b)
      • P(c);EP,XP(C)::P=Q
      • S(b);::0-0
      • P(g);OGATE::B(J)+P(H),XP(g),EP
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