MESON Chess Problem Database

Problem Display
PID: 144799 (7B/8/1p1p2b1/rQ4P1/r1n4K/bP1kN1R1/1P1Nn3/3R1B2 w - - 0 1)

Restad, Birger

Magyar Sakkvilag, 1931

7B/8/1p1p2b1/rQ4P1/r1n4K/bP1kN1R1/1P1Nn3/3R1B2

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Ra6
      • 2.Qd5#
    • 1...Ra7
      • 2.Qd5#
    • 1...Ra8
      • 2.Qd5#
    • 1...Bb4
      • 2.Qxc4#
    • 1...Be4
      • 2.Sb1#
      • 2.Sdxc4#
  • Tries
    • 1.bxa4?
      • threat
        • 2.Qxc4#
        • 2.Qb3#
      • 1...Rxa4
        • 2.Qb3#
        • 2.Qd5#
      • 1...Bxb2
        • 2.Qxc4#
      • 1...Bb4
        • 2.Qxc4#
      • 1...Bf7
        • 2.Qb3#
      • 1...d5
        • 2.Qb3#
      • 1...Rxb5!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Sdxc4#
      • 1...Sxb2+
        • 2.Sg4#
      • 1...Sxd2+
        • 2.Sg4#
      • 1...Sxe3+
        • 2.Se4#
      • 1...Se5+
        • 2.Sdc4#
        • 2.Se4#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Bb4
        • 2.Qxc4#
      • 1...d5
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • R(f);N_GUARD::QAR2(I)
    • B(b);S_CUTR(d)::QAB1(I),XS(e)
  • Tries
    • Try
      • P(E);XR(d)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);XP(C)::QAB1(I),XS(e)
        • B(b);::QAB1(I),XS(e)
        • B(i);::QAR2(I)
        • P(h);::QAR2(I)
      • Refutation
        • R(f);XQ(I)
  • Actual
    • Q(I);
    • Threat
      • R(A)+S(D),XS(e)
    • Vars
      • S(e);CHECK,N_GUARD,XP(C)::R(G)+S(F)
      • S(e);CHECK,N_GUARD,N_SPINS(a),P_SPINS(e),XS(D)::R(G)+S(F)
      • S(e);CHECK,N_GUARD,XS(F)::R(A)+S(D)
      • R(f);N_GUARD::QAR2(I),XR(f)
      • B(b);S_CUTR(d)::QAB1(I),XS(e)
      • P(h);OGATE::QAB(I),XB(i)
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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).