MESON Chess Problem Database

Problem Display
PID: 264970 (1B6/8/5p2/r2nNN1K/2P1kb1R/R4ppB/2P1n3/3b1Q1q w - - 0 1)

Boersma, Kornelis Thomas

Probleemblad, 1949

1B6/8/5p2/r2nNN1K/2P1kb1R/R4ppB/2P1n3/3b1Q1q

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Qxf3#
    • 1...Qh2
      • 2.Qxf3#
    • 1...Sg1
      • 2.Qd3#
    • 1...Sec3
      • 2.Qd3#
    • 1...Sd4
      • 2.Sxg3#
      • 2.Qd3#
    • 1...Se3
      • 2.Rxe3#
    • 1...Sb4
      • 2.Re3#
    • 1...Sb6
      • 2.Re3#
    • 1...Sc7
      • 2.Re3#
    • 1...Se7
      • 2.Re3#
    • 1...g2
      • 2.Qxf3#
  • Tries
    • 1.Qxd1?
      • threat
        • 2.Qd3#
      • 1...Rxa3
        • 2.Qxd5#
      • 1...Sc7
        • 2.Re3#
      • 1...Sc1
        • 2.Sxg3#
        • 2.Qd4#
      • 1...Sb4
        • 2.Re3#
      • 1...Qxd1!
  • Keys
    • 1.Sxf3!
      • threat
        • 2.Sd2#
        • 2.Sd6#
      • 1...Qxf3+
        • 2.Qxf3#
      • 1...Qxh3
        • 2.Sd6#
      • 1...Rxa3
        • 2.Sd2#
      • 1...Ra6
        • 2.Sd2#
      • 1...Sc1
        • 2.Sxg3#
        • 2.Sd6#
      • 1...Sg1
        • 2.Sxg3#
        • 2.Sd6#
        • 2.Qd3#
      • 1...Sec3
        • 2.Qd3#
      • 1...Sd4
        • 2.Sxg3#
        • 2.Sd6#
        • 2.Qd3#
      • 1...Sdc3
        • 2.Sd2#
      • 1...Se3
        • 2.Sd2#
        • 2.Rxe3#
      • 1...Sb4
        • 2.Sd2#
        • 2.Re3#
      • 1...Sb6
        • 2.Sd2#
        • 2.Re3#
      • 1...Sc7
        • 2.Re3#
      • 1...Se7
        • 2.Sd2#
        • 2.Re3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_GUARD::QAB1(A),XP(d)
    • S(c);OGATE::QAB1(A)
    • S(i);N_GUARD::R1(C),XS(i)
    • S(i);N_GUARD::R1(C)
    • P(e);S_CUTQ(b)::QAB1(A),XP(d)
  • Tries
    • Try
      • Q(A);XB(a)
      • Threat
        • QAB1(A)
      • Vars
        • R(h);N_GUARD,XR(C)::QAB1(A),XS(i)
        • S(i);N_GUARD::R1(C)
      • Refutation
        • Q(b);XQ(A)
  • Actual
    • S(G);XP(d)
    • Threat
      • DUALS(2)
    • Vars
      • Q(b);CHECK,OGATE,XS(G)::QAB1(A),XQ(b)
      • Q(b);P_PINR(F),XB(D)::S(H)
      • R(h);XR(C)::S(G)
      • R(h);::S(G)
      • S(c);OGATE,P_PINS(G)::QAB1(A)
      • S(i);P_PINS(H)::S(G)
      • S(i);N_GUARD,P_PINS(H)::R1(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).