MESON Chess Problem Database

Problem Display
PID: 101539 (2r1NbK1/2p2Q2/pp6/2k3PR/3N1P2/P6r/1R2bB2/5B2 w - - 0 1)

Larsen, Karl Adolf Koefoed

Good Companions, 1919

2r1NbK1/2p2Q2/pp6/2k3PR/3N1P2/P6r/1R2bB2/5B2

#2

11 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rf3
      • 2.g6#
    • 1...Bd1
      • 2.Qc4#
      • 2.Qf5#
    • 1...Bf3
      • 2.Rc2#
      • 2.Qc4#
    • 1...Bc4
      • 2.Qxc4#
    • 1...Bg4
      • 2.Qc4#
    • 1...Bb5
      • 2.Qf5#
    • 1...Bxh5
      • 2.Qc4#
      • 2.Qf5#
    • 1...c6
      • 2.Sf3#
  • Tries
    • 1.Rc2+?
      • 1...Bc4
        • 2.Rxc4#
        • 2.Qxc4#
      • 1...Rc3!
    • 1.Rb5+?
      • 1...Bxb5
        • 2.Qf5#
      • 1...axb5!
    • 1.Qxc7+?
      • 1...Kd5
        • 2.Sf6#
      • 1...Rxc7!
    • 1.g6+?
      • 1...Bxh5
        • 2.Qc4#
        • 2.Qf5#
      • 1...Rxh5!
  • Keys
    • 1.Bg2!
      • threat
        • 2.Qd5#
      • 1...b5
        • 2.Sb3#
      • 1...Rf3
        • 2.g6#
      • 1...Rd8
        • 2.Qxc7#
      • 1...Bf3
        • 2.Rc2#
      • 1...Bc4
        • 2.Se6#
      • 1...c6
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(b);N_GUARD,S_CUTB(a)::R(H)+P(G)
    • B(a);N_GUARD,P_PINQ(I)::QAR1(I),XB(a)
    • B(a);N_GUARD::QAR1(I)
    • B(a);::QAR(I)
    • P(f);SBLOCK::B(C)+S(E)
  • Tries
    • Try
      • R(B);CHECK
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • R(B);CHECK
      • Vars
        • B(a);XR(B)::QAR(I)
      • Refutation
        • P(d);XR(B)
    • Try
      • Q(I);CHECK,XP(f)
      • Vars
        • K(c);P-FLIGHT::S(J)
      • Refutation
        • R(g);XQ(I)
    • Try
      • P(G);CHECK
      • Refutation
        • R(b);XR(H)
  • Actual
    • B(A);
    • Threat
      • QAR1(I)
    • Vars
      • P(e);SBLOCK::B(C)+S(E),DCHECK
      • R(b);N_GUARD,S_CUTB(a)::R(H)+P(G)
      • R(g);N_GUARD::QAR2(I),XP(f)
      • B(a);N_GUARD,S_CUTR(b)::R(B)
      • B(a);P_PINQ(I),SBLOCK::B(C)+S(E),DCHECK
      • P(f);SBLOCK::B(C)+S(E)
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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).