MESON Chess Problem Database

Problem Display
PID: 239932 (8/1p4K1/br2p3/2N1n2R/RP1kP3/3p4/B2P2Qp/6b1 w - - 0 1)

Hannelius, Jan Ingvar

Parallele 50, 1947

8/1p4K1/br2p3/2N1n2R/RP1kP3/3p4/B2P2Qp/6b1

#2

9 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb4
      • 2.Sxe6#
    • 1...Rb5
      • 2.Sxe6#
    • 1...Bf2
      • 2.Qxf2#
    • 1...Sf3
      • 2.b5#
    • 1...Sc4
      • 2.Sb3#
    • 1...Sg4
      • 2.b5#
    • 1...Sc6
      • 2.Sxe6#
    • 1...Sg6
      • 2.b5#
    • 1...Sd7
      • 2.b5#
    • 1...Sf7
      • 2.b5#
    • 1...h1B
      • 2.Qxg1#
  • Tries
    • 1.Qf1?
      • threat
        • 2.Qa1#
      • 1...Sc4
        • 2.Qxd3#
      • 1...Rxb4!
    • 1.b5+?
      • 1...Sc4
        • 2.Sb3#
        • 2.Rxc4#
      • 1...Kxc5!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Qxe5#
      • 1...Sf3
        • 2.b5#
      • 1...Sc4
        • 2.Qxd3#
      • 1...Sg4
        • 2.b5#
      • 1...Sc6
        • 2.Qd6#
      • 1...Sg6
        • 2.b5#
      • 1...Sd7
        • 2.b5#
      • 1...Sf7
        • 2.b5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • R(g);N_GUARD,P_SPINR(g),XP(E)::S(G),XP(h)
    • R(g);N_GUARD::S(G),XP(h)
    • B(a);N_GUARD::QAB(C),XB(a)
    • S(e);N_GUARD::R(D)+P(E)
    • S(e);SBLOCK::S(G)
    • S(e);S_CUTR(g)::S(G),XP(h)
    • P(b);N_GUARD::QAB(C),XB(a)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB(C)
      • Vars
        • S(e);N_GUARD,S_CUTB(f)::QAR1(C),XP(c)
      • Refutation
        • R(g);P_SPINR(g),XP(E)
    • Try
      • P(E);CHECK
      • Refutation
        • K(d);P_SPINS(e),S_FLIGHT,XS(G)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C),XS(e)
    • Vars
      • S(e);N_GUARD::R(D)+P(E)
      • S(e);N_GUARD,S_CUTB(f)::QAR1(C),XP(c)
      • S(e);OGATE::QAR2(C)
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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).