MESON Chess Problem Database

Problem Display
PID: 272392 (2b1Rr2/3n1n2/3pB3/K2N4/2N1kbP1/1R6/p2pP3/q4rB1 w - - 0 1)

Karlstrom, Alfred Olaf

Schackvarlden, 1938

2b1Rr2/3n1n2/3pB3/K2N4/2N1kbP1/1R6/p2pP3/q4rB1

#2

9 + 11

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qc3+
      • 2.Sxc3#
    • 1...Qb1
      • 2.Sc3#
    • 1...Qd1
      • 2.Sc3#
    • 1...Qe1
      • 2.Sc3#
    • 1...Rf3
      • 2.exf3#
    • 1...Be5
      • 2.Sxd2#
    • 1...Sde5
      • 2.Sf6#
    • 1...Sfe5
      • 2.Sxd6#
  • Tries
    • 1.Bxf7+?
      • 1...Qe5
        • 2.Sxd6#
      • 1...Be5
        • 2.Sxd2#
        • 2.Sxd6#
      • 1...Se5
        • 2.Sxd6#
        • 2.Sf6#
      • 1...Rxe8!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Bf5#
      • 1...Qc3+
        • 2.Sxc3#
      • 1...Qd4
        • 2.Rxd4#
      • 1...Be5
        • 2.Sxd2#
      • 1...Sde5
        • 2.Sf6#
      • 1...Sfe5
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(a);CHECK,N_GUARD::S(G),XQ(a)
    • Q(a);N_GUARD::S(G)
    • R(b);OGATE::P(B),XR(b)
    • B(f);N_GUARD,SBLOCK::S(D),XP(d)
    • S(h);N_GUARD,S_CUTQ(a)::S(G)
    • S(i);N_GUARD,SBLOCK,S_CUTB(f)::S(D),XP(g)
  • Tries
    • Try
      • B(H);CHECK,XS(i)
      • Vars
        • Q(a);P_PINS(G),P_SPINQ(a)::S(D),XP(g)
      • Refutation
        • R(k);XR(I)
  • Actual
    • R(C);
    • Threat
      • R(I)+B(H),DCHECK
    • Vars
      • Q(a);CHECK,N_GUARD::S(G),XQ(a)
      • Q(a);N_GUARD::R1(C),XQ(a)
      • B(f);N_GUARD,SBLOCK::S(D),XP(d)
      • S(h);N_GUARD,S_CUTQ(a)::S(G)
      • S(i);N_GUARD,SBLOCK,S_CUTB(f)::S(D),XP(g)
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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).