MESON Chess Problem Database

Problem Display
PID: 78515 (1b6/n7/N4R2/p3B3/b1kNB3/4Q3/8/4n2K w - - 0 1)

Onkoud, Abdelaziz

Comm., The Problemist, 2007

1b6/n7/N4R2/p3B3/b1kNB3/4Q3/8/4n2K

#2

7 + 6

56 The Problemist 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Bb3
      • 2.Qxb3#
    • 1...Bb5
      • 2.Qb3#
    • 1...Bc6
      • 2.Qb3#
    • 1...Bd7
      • 2.Qb3#
    • 1...Be8
      • 2.Qb3#
    • 1...Sc2
      • 2.Qd3#
    • 1...Sg2
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
    • 1...Sf3
      • 2.Qd3#
    • 1...Sb5
      • 2.Rc6#
  • Tries
    • 1.Rf3?
      • threat
        • 2.Qc3#
      • 1...Sxf3
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sb5!
    • 1.Rc6+?
      • 1...Bxc6
        • 2.Qb3#
      • 1...Sxc6!
    • 1.Rd6?
      • threat
        • 2.Bd5#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Bc6
        • 2.Qb3#
      • 1...Bxd6!
    • 1.Qe2+?
      • 1...Sd3
        • 2.Qxd3#
      • 1...Kc3!
    • 1.Qa3?
      • threat
        • 2.Qc5#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Bd6!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Sa3#
      • 1...Kxb5
        • 2.Qc5#
      • 1...Bxb5
        • 2.Qc3#
      • 1...Sxb5
        • 2.Rc6#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Bd6
        • 2.Sxd6#
      • 1...Sc2
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • B(b);N_GUARD::QAB1(B),XB(b)
    • B(b);N_GUARD::QAB1(B)
    • B(b);N_GUARD,P_PINB(D)::QAB1(B)
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
    • S(e);N_GUARD,S_CUTB(b)::R(G)
  • Tries
    • Try
      • R(G);
      • Threat
        • QAR1(B)
      • Vars
        • S(a);N_GUARD,XR(G)::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
      • Refutation
        • S(e);
    • Try
      • R(G);CHECK
      • Vars
        • B(b);P_PINB(D),XR(G)::QAB1(B)
      • Refutation
        • S(e);XR(G)
    • Try
      • R(G);
      • Threat
        • B(D)
      • Vars
        • S(a);N_GUARD::QAB1(B),XS(a)
        • B(b);N_GUARD,P_PINB(D)::QAB1(B)
      • Refutation
        • B(f);XR(G)
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(B),XS(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • S(a);N_GUARD::QAB1(B),XS(a)
      • Refutation
        • B(f);
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • K(c);S_FLIGHT,XS(C)::QAR1(B)
      • B(b);SBLOCK,XS(C)::QAR1(B)
      • S(e);N_GUARD,SBLOCK,XS(C)::R(G)
      • S(a);N_GUARD::QAB1(B),XS(a)
      • B(f);N_GUARD::S(C),XB(f)
      • S(a);N_GUARD::QAB1(B)
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).