MESON Chess Problem Database

Problem Display
PID: 70230 (3R1q2/3Q3B/b2b1pn1/5r2/3n1r2/R1PkPP1N/1P1N4/3K2B1 w - - 0 1)

Malmstrom, Birger Georg Christens

Good Companions (February), 1923

3R1q2/3Q3B/b2b1pn1/5r2/3n1r2/R1PkPP1N/1P1N4/3K2B1

#2

12 + 9

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Sxf4#
    • 1...Bb4
      • 2.cxb4#
    • 1...Sxf3
      • 2.c4#
    • 1...Sc6
      • 2.c4#
    • 1...Se6
      • 2.c4#
    • 1...Se5
      • 2.Sxf4#
  • Tries
    • 1.Qxf5+?
      • 1...Re4
        • 2.Qxe4#
      • 1...Sxf5
        • 2.c4#
      • 1...Rxf5!
    • 1.c4+?
      • 1...Sb3
        • 2.Rxb3#
      • 1...Bxa3!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Sf2#
      • 1...Rxf3
        • 2.Qe4#
      • 1...Sxe6
        • 2.c4#
      • 1...Re4
        • 2.Qxe4#
      • 1...Re5
        • 2.Sxf4#
      • 1...Be5
        • 2.Qxa6#
      • 1...Se5
        • 2.Sxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(d);N_GUARD,P_SPINS(h),S_CUTB(f)::S(I),XR(c)
    • B(f);OGATE,P_SPINS(b)::R(E)+P(F),XB(f)
    • S(b);N_GUARD,P_SPINB(f),XP(H)::R(E)+P(F)
    • S(b);N_GUARD,P_SPINB(f)::R(E)+P(F)
    • S(h);N_GUARD,P_SPINR(d),S_CUTB(f)::S(I),XR(c)
  • Tries
    • Try
      • Q(J);CHECK,XR(d)
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAB1(J),XR(c)
        • S(b);P_SPINB(f),XQ(J)::R(E)+P(F)
      • Refutation
        • R(c);XQ(J)
    • Try
      • P(F);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINB(f),P_SPINS(b)::R(E),XS(b)
      • Refutation
        • B(f);P_SPINS(b),XR(E)
  • Actual
    • Q(J);
    • Threat
      • S(I)
    • Vars
      • R(c);N_GUARD,XP(H)::QAB1(J)
      • S(b);N_GUARD,P_SPINB(f),XQ(J)::R(E)+P(F)
      • R(c);N_GUARD::QAB1(J),XR(c)
      • R(d);N_GUARD,P_SPINS(h),S_CUTB(f)::S(I),XR(c)
      • B(f);OGATE,P_SPINS(b)::QAB(J),XB(e)
      • S(h);N_GUARD,P_SPINR(d),S_CUTB(f)::S(I),XR(c)
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).