MESON Chess Problem Database

Problem Display
PID: 208779 (3b4/4p3/4P3/2BpP2p/r1qN1K1k/2R1P2r/5N1P/8 w - - 0 1)

Ortman, A

Dubuque Chess Journal, 1876

3b4/4p3/4P3/2BpP2p/r1qN1K1k/2R1P2r/5N1P/8

#2

9 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rg3
      • 2.hxg3#
    • 1...Ba5
      • 2.Bxe7#
    • 1...Bb6
      • 2.Bxe7#
    • 1...Bc7
      • 2.Bxe7#
  • Tries
    • 1.Rxc4?
      • threat
        • 2.Sf5#
      • 1...Rf3+
        • 2.Sxf3#
      • 1...Rxc4!
  • Keys
    • 1.e4!
      • threat
        • 2.Sf5#
        • 2.Rxh3#
      • 1...Rf3+
        • 2.Sxf3#
      • 1...Qxc3
        • 2.Sf5#
      • 1...Qxd4
        • 2.Rxh3#
      • 1...Rxh2
        • 2.Sf3#
        • 2.Sf5#
      • 1...Rxc3
        • 2.Sf5#
      • 1...Qf1
        • 2.Sf5#
      • 1...Qb3
        • 2.Sf5#
      • 1...Qd3
        • 2.Sf5#
      • 1...Rd3
        • 2.Sf5#
      • 1...Re3
        • 2.Sf5#
      • 1...Rg3
        • 2.Sf5#
        • 2.hxg3#
      • 1...Ra3
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 4
  • Sets
    • R(a);OGATE::P(B),XR(a)
    • B(h);N_GUARD,SBLOCK::B(G),XP(g)
    • B(h);N_GUARD::B(G),XP(g)
    • B(h);N_GUARD,P_PINP(H)::B(G),XP(g)
  • Tries
    • Try
      • R(C);N_SPINS(E),XQ(c)
      • Threat
        • S(E)
      • Vars
        • R(a);CHECK,N_GUARD::S(E),XR(a)
      • Refutation
        • R(b);P_PINS(E),XR(C)
  • Actual
    • P(D);N_SPINS(E)
    • Threat
      • DUALS(2)
    • Vars
      • R(a);CHECK,N_GUARD::S(E),XR(a)
      • Q(c);XR(C)::S(E)
      • Q(c);P_PINP(D),XS(E)::R1(C),XR(a)
      • R(a);XR(C)::S(E)
      • Q(c);P_PINS(A)::S(E)
      • Q(c);::S(E)
      • R(a);::S(E)
      • R(b);::S(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).