MESON Chess Problem Database

Problem Display
PID: 215 (6QB/b2N3B/2ppn3/3k4/1P6/1P3n2/2PP3p/2qR1N1K w - - 0 1)

Valve, Leo Erland

Parallele 50, 1950

6QB/b2N3B/2ppn3/3k4/1P6/1P3n2/2PP3p/2qR1N1K

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.c4#
    • 1...Qxd2
      • 2.c4#
    • 1...Qa3
      • 2.c4#
    • 1...Qa1
      • 2.c4#
    • 1...Qb1
      • 2.c4#
    • 1...Qxd1
      • 2.c4#
    • 1...Be3
      • 2.Sxe3#
    • 1...Bb6
      • 2.Sxb6#
    • 1...Bb8
      • 2.Se3#
      • 2.Sb6#
    • 1...Sxd2
      • 2.Qg2#
    • 1...Sd4
      • 2.Se3#
    • 1...c5
      • 2.Qa8#
  • Tries
    • 1.Bc3?
      • threat
        • 2.Sf6#
      • 1...c5
        • 2.Qa8#
      • 1...Sd4
        • 2.Se3#
      • 1...Bd4!
  • Keys
    • 1.d4!
      • threat
        • 2.Sf6#
      • 1...Qxd1
        • 2.c4#
      • 1...Bxd4
        • 2.Sb6#
      • 1...Sxd4
        • 2.Qg2#
      • 1...c5
        • 2.Qa8#
      • 1...Qd2
        • 2.c4#
      • 1...Qf4
        • 2.c4#
      • 1...Qg5
        • 2.c4#
      • 1...Qh6
        • 2.c4#
      • 1...Sd2
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_GUARD::P(D)
    • Q(a);N_GUARD,P_SPINQ(a),XP(E)::P(D)
    • Q(a);N_GUARD,P_PINS(B),XR(A)::P(D)
    • B(h);N_GUARD::S(B),XB(h)
    • B(h);N_GUARD::S(H),XB(h)
    • S(c);N_SPINS(g),OGATEB,P_SPINS(c),XP(E)::QAB(J)
    • S(c);S_CUTB(h)::S(B)
    • P(e);OGATEB::QAB(J)
  • Tries
    • Try
      • B(K);
      • Threat
        • S(H)
      • Vars
        • P(e);OGATEB::QAB(J)
        • S(c);S_CUTB(h)::S(B)
      • Refutation
        • B(h);
  • Actual
    • P(E);
    • Threat
      • S(H)
    • Vars
      • Q(a);N_GUARD,P_PINS(B),XR(A)::P(D)
      • B(h);N_GUARD,P_SPINB(h),XP(E)::S(H)
      • S(c);N_SPINS(g),OGATEB,P_SPINS(c),XP(E)::QAB(J)
      • P(e);OGATEB::QAB(J)
      • Q(a);N_GUARD::P(D)
      • S(c);S_CUTQ(a)::S(B)
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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).