MESON Chess Problem Database

Problem Display
PID: 16750 (2B5/1Q5b/1pp2R2/6p1/Rn1nk1N1/3N3K/2PP2P1/B5b1 w - - 0 1)

Valve, Leo Erland

Vapenbrodern, 1942

2B5/1Q5b/1pp2R2/6p1/Rn1nk1N1/3N3K/2PP2P1/B5b1

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Qxc6#
    • 1...Sxd3
      • 2.Qxc6#
    • 1...Sd5
      • 2.Qxh7#
    • 1...Sa6
      • 2.Qxc6#
    • 1...Se2
      • 2.Qxc6#
    • 1...Sb3
      • 2.Qxc6#
    • 1...Sf3
      • 2.Qxc6#
    • 1...Sb5
      • 2.Qxc6#
    • 1...Sf5
      • 2.Qxc6#
    • 1...Se6
      • 2.Qxc6#
  • Tries
    • 1.Rf4+?
      • 1...gxf4
        • 2.Sf6#
      • 1...Kd5!
    • 1.Qe7+?
      • 1...Se6
        • 2.Qxe6#
      • 1...Kd5!
    • 1.Qxh7+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Kd5!
  • Keys
    • 1.Rxc6!
      • threat
        • 2.Sf6#
      • 1...Kd5
        • 2.Sf6#
      • 1...Sbxc2
        • 2.Rc3#
      • 1...Sxd3
        • 2.Rf6#
      • 1...Sdxc2
        • 2.Rd6#
      • 1...Se6
        • 2.Rc5#
      • 1...Bf5
        • 2.Re6#
      • 1...Sd5
        • 2.Qxh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • S(b);N_GUARD,P_SPINS(c)::QAB(J),XP(g)
    • S(b);N_GUARD,P_SPINS(c),XS(E)::QAB(J),XP(g)
    • S(b);N_SPINP(g),P_SPINS(c),SBLOCK::QAB(J),XB(h)
    • S(c);N_GUARD,P_SPINS(b)::QAB(J),XP(g)
  • Tries
    • Try
      • R(I);CHECK
      • Vars
        • P(e);XR(I)::S(H)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(J);CHECK,N_PINP(g)
      • Vars
        • S(c);N_GUARD,P_SPINS(b)::QAR2(J),XS(c)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(J);CHECK,N_PINP(g),XB(h)
      • Vars
        • S(c);N_GUARD,P_SPINS(b)::QAB1(J),XS(c)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • R(I);XP(g)
    • Threat
      • S(H)
    • Vars
      • K(d);S_FLIGHT::S(H)
      • S(b);N_GUARD,P_SPINS(c),XP(B)::QAB(J)+R(I)
      • S(b);N_GUARD,P_SPINS(c),XS(E)::QAB(J)+R(I)
      • S(c);N_GUARD,P_SPINS(b),XP(B)::QAB(J)+R(I)
      • S(c);N_GUARD,P_SPINS(b)::QAB(J)+R(I)
      • B(h);P_PINS(H),SBLOCK::QAB(J)+R(I),DCHECK
      • S(b);P_SPINS(c),SBLOCK::QAB(J),XB(h)
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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).