MESON Chess Problem Database

Problem Display
PID: 160729 (8/1N3p2/8/1PpkP3/6Q1/Rn1q1P2/2PnPP1B/3R2KB w - - 0 1)

Apro, Laszlo

Schach, 1953

8/1N3p2/8/1PpkP3/6Q1/Rn1q1P2/2PnPP1B/3R2KB

#2

13 + 6

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Qd7#
    • 1...Qg6
      • 2.c4#
    • 1...Qh7
      • 2.c4#
    • 1...Qe3
      • 2.c4#
    • 1...Qxf3
      • 2.Bxf3#
      • 2.c4#
    • 1...Sb1
      • 2.c4#
    • 1...Sf1
      • 2.c4#
    • 1...Sxf3+
      • 2.Bxf3#
    • 1...Sa1
      • 2.Rxd3#
    • 1...Sa5
      • 2.Rxd3#
    • 1...c4
      • 2.Qd7#
  • Tries
    • 1.c4+?
      • 1...Qxc4
        • 2.Qd7#
      • 1...Sxc4!
  • Keys
    • 1.Ra4!
      • threat
        • 2.Qd7#
      • 1...Sxf3+
        • 2.Bxf3#
      • 1...Qxb5
        • 2.f4#
      • 1...Qf5
        • 2.Qc4#
      • 1...f5
        • 2.Qg8#
      • 1...Qg6
        • 2.c4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Se4
        • 2.fxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • Q(c);P_SPINS(a),SBLOCK::QAR2(J)
    • Q(c);N_GUARD,P_PINQ(J),P_SPINS(a)::P(D)
    • Q(c);N_GUARD,P_SPINS(a)::P(D)
    • Q(c);N_GUARD,P_PINP(F),P_SPINS(a)::P(D)
    • S(a);N_GUARD,P_SPINQ(c)::P(D)
    • S(a);CHECK,OGATE,P_SPINQ(c),P_SPINS(a),XP(I)::B(C),XS(a)
    • S(b);OGATE::R(H),XQ(c)
    • P(d);SBLOCK::QAR2(J)
  • Tries
    • Try
      • P(D);CHECK
      • Vars
        • Q(c);P_SPINS(a),SBLOCK,XP(D)::QAR2(J)
      • Refutation
        • S(a);P_SPINQ(c),XP(D)
  • Actual
    • R(H);
    • Threat
      • QAR2(J)
    • Vars
      • S(a);CHECK,OGATE,P_SPINQ(c),P_SPINS(a),XP(I)::B(C),XS(a)
      • Q(c);N_GUARD,P_SPINS(a),XP(K)::B(C)+P(I)
      • Q(c);N_GUARD,P_SPINS(a)::QAB1(J)
      • P(f);OGATEB::QAB(J)
      • Q(c);N_GUARD,P_PINQ(J),P_SPINS(a)::P(D)
      • S(a);N_GUARD,P_SPINQ(c)::QAB1(J),XS(a)
      • S(a);OGATE,P_SPINQ(c)::P(I),XS(a)
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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).