MESON Chess Problem Database

Problem Display
PID: 65053 (2N1nN2/3p4/2Rp4/3kn1qR/KP2r2p/3p4/1B1brpQ1/8 w - - 0 1)

Malmstrom, Birger Georg Christens

Good Companions (December), 1921

2N1nN2/3p4/2Rp4/3kn1qR/KP2r2p/3p4/1B1brpQ1/8

#2

8 + 12

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Se7#
    • 1...Qf4
      • 2.Se7#
    • 1...Qh6
      • 2.Se7#
    • 1...Qe7
      • 2.Sxe7#
    • 1...Qxg2
      • 2.Se7#
    • 1...Qg3
      • 2.Se7#
    • 1...Qg4
      • 2.Se7#
    • 1...Qf5
      • 2.Se7#
    • 1...Qxh5
      • 2.Se7#
    • 1...Qg6
      • 2.Se7#
    • 1...Qg8
      • 2.Se7#
    • 1...Sc4
      • 2.Se7#
    • 1...Sg4
      • 2.Se7#
    • 1...Sxc6
      • 2.Sb6#
    • 1...Sf7
      • 2.Se7#
    • 1...Sf6
      • 2.Se7#
    • 1...dxc6
      • 2.Sb6#
  • Tries
    • 1.Rxd6+?
      • 1...Kc4
        • 2.Sb6#
      • 1...Sxd6!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Sb6#
      • 1...Kxc4
        • 2.Sb6#
      • 1...Sxc4
        • 2.Se7#
      • 1...Qe3
        • 2.Qg8#
      • 1...Qd8
        • 2.Qg8#
      • 1...Be3
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 15
  • Sets
    • Q(i);N_GUARD,P_SPINS(h)::S(G)
    • Q(i);N_GUARD,P_SPINS(h)::S(G),XQ(i)
    • Q(i);N_GUARD,N_SPINR(e),P_SPINS(h),XQ(B)::S(G)
    • Q(i);N_GUARD::S(G)
    • Q(i);N_GUARD,XR(E)::S(G)
    • S(h);N_PINP(D),P_SPINQ(i)::S(G)
    • S(h);P_SPINQ(i)::S(G)
    • S(h);P_SPINQ(i),SBLOCK,XR(F)::S(G)
    • S(l);S_CUTQ(i)::S(G)
    • P(k);SBLOCK,XR(F)::S(G)
  • Tries
    • Try
      • R(F);CHECK,XP(j)
      • Vars
        • K(g);N_PINP(D),N_SPINR(e),S_FLIGHT::S(G)
      • Refutation
        • S(l);XR(F)
  • Actual
    • R(F);N_SPINP(D)
    • Threat
      • S(G)
    • Vars
      • K(g);N_SPINR(e),S_FLIGHT,XR(F)::S(G)
      • S(h);P_SPINQ(i),SBLOCK,XR(F)::S(G)
      • Q(i);OGATE,P_SPINS(h)::QAB(B)
      • B(a);S_CUTR(b)::QAB1(B),XR(e)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).