MESON Chess Problem Database

Problem Display
PID: 16450 (1b1r4/1Knp2p1/1N5R/2p1kpP1/R6N/BBn2PP1/3r4/2q4b w - - 0 1)

Froberg, Johan Hilding Laurentius

3rd Prize, Schackvarlden TT, 1940

1b1r4/1Knp2p1/1N5R/2p1kpP1/R6N/BBn2PP1/3r4/2q4b

#2

10 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf3+
      • 2.Sxf3#
    • 1...Se4
      • 2.f4#
    • 1...f4
      • 2.gxf4#
    • 1...d5
      • 2.f4#
    • 1...d6
      • 2.Sg6#
  • Tries
    • 1.Sc4+?
      • 1...Kd5
        • 2.Rd6#
      • 1...Kd4!
  • Keys
    • 1.Bxc5!
      • threat
        • 2.Sg6#
      • 1...Bxf3+
        • 2.Sxf3#
      • 1...Rd5
        • 2.Sc4#
      • 1...Rd6
        • 2.Bxd6#
      • 1...S3d5
        • 2.Bd6#
      • 1...S7d5
        • 2.Sc4#
      • 1...f4
        • 2.gxf4#
      • 1...d5
        • 2.f4#
      • 1...g6
        • 2.Sxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • B(b);CHECK,XP(C)::S(F),XB(b)
    • S(d);N_PINP(C)::P(C)
    • P(g);OGATE::P(D),XP(g)
    • P(i);N_PINP(C)::P(C)
    • P(i);SBLOCK::S(F)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(f);N_PINP(C),P-FLIGHT::R1(I)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • B(A);XP(e)
    • Threat
      • S(F)
    • Vars
      • B(b);CHECK,XP(C)::S(F),XB(b)
      • R(c);N_PINP(C),SBLOCK::S(H)
      • R(c);N_GUARD::B(A),XR(c)
      • S(d);N_PINP(C),S_CUTR(c)::B(A)
      • S(h);N_PINP(C),SBLOCK::S(H)
      • P(g);OGATE::P(D),XP(g)
      • P(i);N_PINP(C)::P(C)
      • P(j);::S(F),XP(j)
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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).