MESON Chess Problem Database

Problem Display
PID: 142150 (R4B2/q1pn4/3bp3/N1nB4/7Q/k5p1/PN6/RK6 w - - 0 1)

Robert, Philippe

Die Schwalbe, 1974

R4B2/q1pn4/3bp3/N1nB4/7Q/k5p1/PN6/RK6

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qa4#
    • 1...Sb3
      • 2.Qa4#
      • 2.axb3#
    • 1...Sd3
      • 2.Qa4#
    • 1...Sa4
      • 2.Qxa4#
    • 1...Sa6
      • 2.Qa4#
    • 1...Sb7
      • 2.Qa4#
  • Tries
    • 1.Bxd6?
      • threat
        • 2.Qa4#
      • 1...Qxa5
        • 2.Rxa5#
      • 1...Sb6
        • 2.Bxc5#
      • 1...cxd6!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Qb4#
      • 1...Bf4
        • 2.Rxa7#
      • 1...Sb3
        • 2.axb3#
      • 1...Sd3
        • 2.Rxa7#
      • 1...Sa4
        • 2.Sc4#
      • 1...Se4
        • 2.Rxa7#
      • 1...Sa6
        • 2.Qa4#
      • 1...Sb7
        • 2.Qxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(d);P_SPINS(c)::QAR1(E)
    • S(c);N_GUARD,P_SPINB(d)::QAR1(E)
    • S(c);N_GUARD,P_SPINB(d)::QAR1(E),XS(c)
  • Tries
    • Try
      • B(I);P_PINS(c),XB(d)
      • Threat
        • QAR1(E)
      • Vars
        • Q(f);OGATE,P_SPINQ(f),XS(F)::R(H),XQ(f)
        • S(h);N_GUARD,S_CUTQ(f)::B(I),XS(c)
      • Refutation
        • P(g);N_SPINS(c),XB(I)
  • Actual
    • S(F);P_PINQ(f)
    • Threat
      • QAB1(E)
    • Vars
      • B(d);P_SPINS(c)::R(H),XQ(f)
      • S(c);OGATE,P_SPINB(d)::R(A)+P(C),XS(c)
      • S(c);N_GUARD,P_SPINB(d)::R(H),XQ(f)
      • S(c);N_SPINQ(f),P_SPINB(d),SBLOCK::S(D)
      • S(c);N_GUARD,N_SPINQ(f),P_SPINB(d),S_CUTQ(f)::QAR1(E)
      • S(c);N_GUARD,P_SPINB(d)::QAR(E),XP(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).