MESON Chess Problem Database

Problem Display
PID: 222462 (3R4/R5Q1/3P4/2p2P2/4kp2/8/1NN4B/1B5K w - - 0 1)

Priester, August

Philadelphia Times, 1883

3R4/R5Q1/3P4/2p2P2/4kp2/8/1NN4B/1B5K

#2

10 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Qg2#
    • 1...Kxf5
      • 2.Sd4#
    • 1...f3
      • 2.Qe5#
  • Tries
    • 1.Ra3?
      • threat
        • 2.Sb4#
      • 1...Kxf5
        • 2.Sd4#
      • 1...Kd5!
    • 1.Re7+?
      • 1...Kf3
        • 2.Qg2#
      • 1...Kxf5
        • 2.Sa1#
        • 2.Se1#
        • 2.Sa3#
        • 2.Se3#
        • 2.Sb4#
        • 2.Sd4#
        • 2.Re5#
        • 2.Rf8#
      • 1...Kd5!
    • 1.Re8+?
      • 1...Kf3
        • 2.Qg2#
      • 1...Kxf5
        • 2.Sa1#
        • 2.Se1#
        • 2.Sa3#
        • 2.Se3#
        • 2.Sb4#
        • 2.Sd4#
        • 2.Rf7#
        • 2.Re5#
      • 1...Kd5!
  • Keys
    • 1.Ra5!
      • 1...Kf3
        • 2.Qg2#
      • 1...Kd5
        • 2.Sb4#
      • 1...Kxf5
        • 2.Sd4#
      • 1...c4
        • 2.Qb7#
      • 1...f3
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAB1(I)
    • K(a);S_FLIGHT,XP(F)::B(A)+S(D),DCHECK
    • P(b);SBLOCK::QAR1(I)
  • Tries
    • Try
      • R(H);
      • Threat
        • B(A)+S(D)
      • Vars
        • K(a);S_FLIGHT,XP(F)::B(A)+S(D),DCHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(H);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(I)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(J);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(I)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • R(H);
    • Vars
      • K(a);S_FLIGHT::QAB1(I)
      • K(a);P_SPINP(c),S_FLIGHT::S(D)
      • K(a);P_SPINP(c),S_FLIGHT,XP(F)::B(A)+S(D),DCHECK
      • P(c);::QAB(I)
      • P(b);SBLOCK::QAR1(I)
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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).