MESON Chess Problem Database

Problem Display
PID: 204384 (1bq5/4rpBp/1Q5N/5pnb/3npk1P/R1r4p/1PB2P2/1K2R1N1 w - - 0 1)

The Hong Oe

L'Alfiere di Re, 1925

1bq5/4rpBp/1Q5N/5pnb/3npk1P/R1r4p/1PB2P2/1K2R1N1

#2

11 + 13

6490 yacpdb 2020
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rg3
      • 2.fxg3#
    • 1...Rc7
      • 2.Qd6#
    • 1...Sdf3
      • 2.Se2#
    • 1...Sgf3
      • 2.Sxh3#
  • Tries
    • 1.Qd6+?
      • 1...Re5
        • 2.Bxe5#
      • 1...Bxd6!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qxg5#
      • 1...Rg3
        • 2.fxg3#
      • 1...Sdf3
        • 2.Se2#
      • 1...Sde6
        • 2.Qxf5#
      • 1...Sgf3
        • 2.Sxh3#
      • 1...Sge6
        • 2.Rxe4#

This anticipates 214931(1942)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(a);OGATE::P(F),XR(a)
    • R(i);N_GUARD,S_CUTB(l)::QAB(I)
    • S(c);N_GUARD,SBLOCK,S_CUTB(h)::S(C)
    • S(g);N_GUARD,SBLOCK,S_CUTR(a)::S(C),XP(b)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • R(i);N_GUARD,P_SPINR(i)::B(K),XR(i)
      • Refutation
        • B(l);XQ(I)
  • Actual
    • Q(I);P_PINP(f)
    • Threat
      • QAB1(I),XS(g)
    • Vars
      • R(a);OGATE::P(F),XR(a)
      • S(c);N_GUARD,SBLOCK,S_CUTB(h)::S(C)
      • S(c);N_GUARD,S_CUTQ(m)::QAR1(I),XP(f)
      • S(g);N_GUARD,SBLOCK,S_CUTR(a)::S(C),XP(b)
      • S(g);N_GUARD,S_CUTR(i)::R1(B),XP(d)
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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).