MESON Chess Problem Database

Problem Display
PID: 89988 (6B1/1K6/3pp3/2NkrN2/3Ppp1Q/1Pn5/2P4B/8 w - - 0 1)

Onkoud, Abdelaziz

Die Schwalbe, 1999

6B1/1K6/3pp3/2NkrN2/3Ppp1Q/1Pn5/2P4B/8

#2

9 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.c4#
    • 1...Sd1
      • 2.c4#
    • 1...Sa2
      • 2.c4#
    • 1...Se2
      • 2.c4#
    • 1...Sa4
      • 2.c4#
    • 1...Sb5
      • 2.c4#
    • 1...dxc5
      • 2.Qd8#
  • Tries
    • 1.Sa4?
      • threat
        • 2.Sxc3#
        • 2.Sb6#
      • 1...Sxa4
        • 2.c4#
      • 1...e3
        • 2.Sxc3#
      • 1...Sb1
        • 2.Sb6#
        • 2.c4#
      • 1...Sd1
        • 2.Sb6#
        • 2.c4#
      • 1...Sa2
        • 2.Sb6#
        • 2.c4#
      • 1...Se2
        • 2.Sb6#
        • 2.c4#
      • 1...Sb5
        • 2.Sb6#
        • 2.c4#
      • 1...Rxf5!
    • 1.Sd7?
      • threat
        • 2.Sb6#
        • 2.Sf6#
      • 1...e3
        • 2.Sf6#
      • 1...Sa4
        • 2.Sf6#
        • 2.c4#
      • 1...Rxf5!
    • 1.Bg1?
      • threat
        • 2.Se7#
      • 1...Rxf5
        • 2.Bxe6#
      • 1...dxc5
        • 2.Qd8#
      • 1...e3!
    • 1.Qe7?
      • threat
        • 2.Qxd6#
      • 1...dxc5
        • 2.Qxc5#
        • 2.Qd6#
        • 2.Qd8#
        • 2.Qd7#
      • 1...Sb5
        • 2.c4#
      • 1...Rxf5!
    • 1.Qd8?
      • threat
        • 2.Qxd6#
      • 1...Sb5
        • 2.c4#
      • 1...Rxf5!
  • Keys
    • 1.Qxf4!
      • 1...Rxf5
        • 2.Qxd6#
      • 1...dxc5
        • 2.Qxe5#
      • 1...e3
        • 2.Se7#
      • 1...Sb1
        • 2.c4#
      • 1...Sd1
        • 2.c4#
      • 1...Sa2
        • 2.c4#
      • 1...Se2
        • 2.c4#
      • 1...Sa4
        • 2.c4#
      • 1...Sb5
        • 2.c4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);OGATE::P(A)
    • P(f);OGATEB,XS(F)::QAR(E)
  • Tries
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);OGATE,XS(F)::P(A)
        • P(b);::S(F),XS(a)
      • Refutation
        • R(e);XS(G)
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::S(F)
      • Refutation
        • R(e);XS(G)
    • Try
      • B(B);
      • Threat
        • S(G)
      • Vars
        • R(e);N_GUARD,XS(G)::B(I),XP(g)
        • P(f);OGATEB,XS(F)::QAR(E)
      • Refutation
        • P(b);
    • Try
      • Q(E);
      • Threat
        • QAR1(E),XP(f)
      • Vars
        • S(a);OGATE::P(A)
      • Refutation
        • R(e);XS(G)
    • Try
      • Q(E);N_PINP(g),P_PINP(f)
      • Threat
        • QAR1(E),XP(f)
      • Vars
        • S(a);OGATE::P(A)
      • Refutation
        • R(e);XS(G)
  • Actual
    • Q(E);XP(c)
    • Vars
      • R(e);OGATE,XS(G)::QAR1(E),XP(f)
      • P(f);N_GUARD,XS(F)::QAR1(E),XR(e)
      • P(b);::S(G)
      • S(a);OGATE::P(A)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).