MESON Chess Problem Database

Problem Display
PID: 273436 (1qBB1n2/1bpr1NP1/4kP1N/6p1/2P1pp2/bQ2P3/1p5K/8 w - - 0 1)

Andrade, Barry Jack da Costa

British Chess Magazine, 1934

1qBB1n2/1bpr1NP1/4kP1N/6p1/2P1pp2/bQ2P3/1p5K/8

#2

10 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Bd5
      • 2.cxd5#
    • 1...c5
      • 2.gxf8S#
    • 1...c6
      • 2.c5#
  • Tries
    • 1.Qxa3?
      • threat
        • 2.Qe7#
        • 2.gxf8S#
      • 1...Qxc8
        • 2.gxf8S#
      • 1...Bxc8
        • 2.gxf8S#
      • 1...Sh7
        • 2.Qe7#
      • 1...c5
        • 2.gxf8S#
      • 1...Sg6!
    • 1.Qb5?
      • threat
        • 2.Qe5#
        • 2.Qf5#
      • 1...Sg6
        • 2.Bxd7#
        • 2.Qxd7#
        • 2.Qf5#
      • 1...Bd6
        • 2.Sxg5#
        • 2.Qf5#
      • 1...Bd5
        • 2.Qxd5#
        • 2.cxd5#
      • 1...c5
        • 2.gxf8S#
      • 1...c6
        • 2.Qf5#
      • 1...Bc5!
    • 1.exf4?
      • threat
        • 2.f5#
      • 1...gxf4
        • 2.Qh3#
      • 1...Bd6
        • 2.Sxg5#
      • 1...c5
        • 2.gxf8S#
      • 1...c6
        • 2.c5#
      • 1...Be7!
  • Keys
    • 1.c5+!
      • 1...Bd5
        • 2.gxf8S#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • B(g);OGATE::P(D),XB(g)
    • P(h);S_CUTB(b)::PXS(k)=S
    • P(h);S_CUTB(g)::QAB(B)+P(D)
  • Tries
    • Try
      • Q(B);XB(b)
      • Threat
        • DUALS(2)
      • Vars
        • Q(j);N_SPINR(i),XB(I)::PXS(k)=S
        • B(g);N_SPINR(i),XB(I)::PXS(k)=S
        • S(k);::QAR1(B)
        • P(h);::PXS(k)=S
      • Refutation
        • S(k);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(h);S_CUTB(b)::PXS(k)=S
        • P(h);::QAB1(B)
      • Refutation
        • B(b);
    • Try
      • P(C);XP(d)
      • Threat
        • P(C)
      • Vars
        • P(e);N_GUARD,XP(C)::QAB(B)
        • B(b);P_PINP(C),SBLOCK::S(G),XP(e)
        • P(h);P_PINP(C),S_CUTB(b)::PXS(k)=S
        • P(h);P_PINP(C),S_CUTB(g)::QAB(B)+P(D)
      • Refutation
        • B(b);
  • Actual
    • P(D);CHECK
    • Vars
      • B(g);N_GUARD,P_SPINB(g)::PXS(k)=S
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).