MESON Chess Problem Database

Problem Display
PID: 223329 (1n6/1P2pK2/3k4/N4PR1/4p3/4P3/Q7/1R6 w - - 0 1)

S, Pasha

Sheffield Independent, 1885

1n6/1P2pK2/3k4/N4PR1/4p3/4P3/Q7/1R6

#2

8 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qe6#
  • Tries
    • 1.Rc1?
      • threat
        • 2.Qe6#
      • 1...Ke5
        • 2.Qe6#
      • 1...Kd7
        • 2.Qd5#
        • 2.Qd2#
      • 1...e6
        • 2.Qxe6#
      • 1...Sc6!
    • 1.Qe6+?
      • 1...Kc5
        • 2.Qe5#
        • 2.f6#
      • 1...Kc7!
    • 1.Qd2+?
      • 1...Kc5
        • 2.Qd4#
      • 1...Ke5
        • 2.Sc4#
        • 2.Rb5#
        • 2.Qd4#
        • 2.f6#
      • 1...Kc7!
    • 1.Qa3+?
      • 1...Kd5
        • 2.Rb5#
      • 1...Ke5
        • 2.Rb5#
        • 2.Qc5#
        • 2.f6#
      • 1...Kd7
        • 2.Qxe7#
      • 1...Kc7!
  • Keys
    • 1.Qh2+!
      • 1...Kc5
        • 2.Qe5#
      • 1...Kd5
        • 2.Rb5#
      • 1...Kd7
        • 2.Rd1#
      • 1...e5
        • 2.fxe5 ep#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(b);S_FLIGHT::QAR1(B)
  • Tries
    • Try
      • R(A);
      • Threat
        • QAR1(B)
      • Vars
        • K(b);S_FLIGHT::QAR1(B)
        • P(c);::QAR1(B),XP(c)
      • Refutation
        • S(d);
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::R(A)
        • K(b);OGATE,P-FLIGHT::QAR1(B),XP(c)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(B);CHECK
    • Vars
      • K(b);S_FLIGHT::QAR2(B)
      • K(b);P-FLIGHT::R(A)
      • P(c);OGATE,P_SPINP(c)::QAB(B)+P(E),XP(c),EP
HTML5 logo

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).