MESON Chess Problem Database

Problem Display
PID: 16767 (2B2K2/1p1N4/2p1kNp1/5p1p/3pqn2/BR4bp/Q6r/4Rb2 w - - 0 1)

Valve, Leo Erland

1st Prize, Aseveli, 1943

2B2K2/1p1N4/2p1kNp1/5p1p/3pqn2/BR4bp/Q6r/4Rb2

#2

8 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe1
      • 2.Re3#
    • 1...Qe2
      • 2.Re3#
    • 1...Qe3
      • 2.Rbxe3#
    • 1...Qe5
      • 2.Rxe5#
    • 1...Se2
      • 2.Re3#
    • 1...Sg2
      • 2.Rd3#
    • 1...Sd3
      • 2.Rb2#
    • 1...c5
      • 2.Rb6#
  • Keys
    • 1.Se8!
      • threat
        • 2.Sc7#
      • 1...Kd5
        • 2.Rb5#
      • 1...Se2
        • 2.Re3#
      • 1...Sg2
        • 2.Rd3#
      • 1...Sd3
        • 2.Rb2#
      • 1...Sd5
        • 2.Sg7#
      • 1...c5
        • 2.Rb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(f);N_SPINQ(f),XR(A)::QAB(B)+R(D),DCHECK
    • Q(f);::QAB(B)+R(D),DCHECK
    • Q(f);::QAB(B)+R(D),DCHECK,XQ(f)
    • Q(f);OGATE::R1(A),XQ(f)
    • S(g);N_GUARD,N_SPINQ(f),S_CUTB(a),S_CUTR(b)::QAB(B)+R(D)
    • S(g);N_GUARD,S_CUTR(b)::QAB(B)+R(D)
    • S(g);N_GUARD,S_CUTB(a)::QAB(B)+R(D)
    • P(j);::QAB(B)+R(D),DCHECK
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • K(k);N_SPINQ(f),S_FLIGHT::QAB(B)+R(D),DCHECK
      • S(g);N_GUARD,N_SPINQ(f),S_CUTB(a),S_CUTR(b)::QAB(B)+R(D)
      • S(g);N_GUARD,S_CUTR(b)::QAB(B)+R(D)
      • S(g);N_GUARD,S_CUTB(a)::QAB(B)+R(D)
      • S(g);SBLOCK::S(E)
      • P(j);::QAB(B)+R(D),DCHECK
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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).