MESON Chess Problem Database

Problem Display
PID: 203306 (r3N3/n1p4K/PpkP4/1p2pQ2/1P6/7p/2b3qb/2RRn2B w - - 0 1)

Nagy, Odon

1st Prize, Gyeri Sakkor, 1924

r3N3/n1p4K/PpkP4/1p2pQ2/1P6/7p/2b3qb/2RRn2B

#2

9 + 12

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Bxe4#
    • 1...Qd5
      • 2.Bxd5#
    • 1...cxd6
      • 2.Rxd6#
  • Tries
    • 1.Bxg2+?
      • 1...Sxg2
        • 2.Rxc2#
      • 1...Sf3
        • 2.Rxc2#
      • 1...e4
        • 2.Bxe4#
      • 1...hxg2!
  • Keys
    • 1.d7!
      • threat
        • 2.Qg6#
      • 1...Rxe8
        • 2.dxe8Q#
        • 2.dxe8B#
      • 1...Sd3
        • 2.Qe6#
      • 1...Qd5
        • 2.Bxd5#
      • 1...Sf3
        • 2.Qe4#
      • 1...Sc8
        • 2.d8S#
      • 1...e4
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(c);OGATE::B(C),XQ(c)
    • P(k);OGATE,XP(G)::R1(B),XP(k)
  • Tries
    • Try
      • B(C);CHECK,XQ(c)
      • Vars
        • S(a);XB(C)::R(A),XB(b)
        • S(a);P_SPINS(a)::R(A),XB(b)
        • P(g);N_PINQ(E),P_SPINP(g)::B(C),XP(g)
      • Refutation
        • P(e);XB(C)
  • Actual
    • P(G);
    • Threat
      • QAR(E)
    • Vars
      • R(l);OGATE,XS(I)::PXR(l)=Q
      • S(a);N_PINQ(E)::QAR2(E)
      • Q(c);OGATE::B(C),XQ(c)
      • S(a);N_SPINQ(c),S_CUTQ(c)::QAB(E)
      • S(j);S_CUTR(l)::P=S
      • P(g);N_PINQ(E),N_SPINQ(c)::QAB1(E)
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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).