MESON Chess Problem Database

Problem Display
PID: 231185 (2R5/1rp2kp1/b3pp2/b2p1BB1/8/8/7Q/5R1K w - - 0 1)

Delpy, Egbert

1st Prize, Sas Feladvanyvers, 1927

2R5/1rp2kp1/b3pp2/b2p1BB1/8/8/7Q/5R1K

#2

6 + 9

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rb6
      • 2.Qxc7#
    • 1...g6
      • 2.Qh7#
  • Tries
    • 1.Qh5+?
      • 1...g6
        • 2.Qh7#
      • 1...Ke7!
    • 1.Qh8?
      • threat
        • 2.Qe8#
        • 2.Qf8#
      • 1...exf5
        • 2.Qe8#
      • 1...fxg5
        • 2.Qf8#
      • 1...Bb4
        • 2.Qe8#
      • 1...Bb5
        • 2.Qf8#
      • 1...g6
        • 2.Qxf6#
        • 2.Qh7#
        • 2.Qf8#
      • 1...Ke7!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qxe6#
      • 1...Ke7
        • 2.Qxe6#
      • 1...exf5
        • 2.Qe8#
      • 1...fxe5
        • 2.Bd3#
      • 1...g6
        • 2.Qxf6#
      • 1...Rb6
        • 2.Qxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(f);N_GUARD,S_CUTB(a)::QAR(C),XP(g)
    • P(i);OGATEB::QAR2(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • P(i);OGATEB,P_SPINP(i)::QAR2(C)
      • Refutation
        • K(h);P-FLIGHT,P_SPINP(e)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);XB(D)::QAB1(C)
        • P(e);XB(E)::QAR1(C)
        • B(a);::QAB1(C)
        • B(c);::QAR1(C)
      • Refutation
        • K(h);P-FLIGHT,P_SPINP(e)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C),XP(d)
    • Vars
      • K(h);P-FLIGHT,P_SPINP(d)::QAR1(C),XP(d)
      • P(d);OGATE,XB(D)::QAB1(C)
      • P(e);OGATEB,XQ(C)::R(A)+B(D)
      • P(i);N_GUARD::QAR1(C),XP(e)
      • R(f);N_GUARD,S_CUTB(a)::QAR(C),XP(g)
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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).