MESON Chess Problem Database

Problem Display
PID: 87612 (8/Q7/2p5/1p6/pk6/1p1PN3/1K6/8 w - - 0 1)

Lester, William Edward

The Problemist, 1930

8/Q7/2p5/1p6/pk6/1p1PN3/1K6/8

#2

4 + 5

1189 The Tablet 1952
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...a3+
      • 2.Qxa3#
    • 1...c5
      • 2.Sd5#
  • Tries
    • 1.Sd1?
      • 1...a3+
        • 2.Qxa3#
      • 1...c5!
    • 1.Sf1?
      • 1...a3+
        • 2.Qxa3#
      • 1...c5!
    • 1.Sg2?
      • 1...a3+
        • 2.Qxa3#
      • 1...c5!
    • 1.Sg4?
      • 1...a3+
        • 2.Qxa3#
      • 1...c5!
    • 1.Sf5?
      • 1...a3+
        • 2.Qxa3#
      • 1...c5!
    • 1.Qb6?
      • 1...c5
        • 2.Sd5#
      • 1...a3+!
    • 1.Qa6?
      • 1...a3+
        • 2.Qxa3#
      • 1...c5
        • 2.Sd5#
      • 1...Kc5!
    • 1.Qa8?
      • 1...a3+
        • 2.Qxa3#
      • 1...c5
        • 2.Sd5#
      • 1...Kc5!
    • 1.d4?
      • 1...a3+
        • 2.Qxa3#
      • 1...c5!
  • Keys
    • 1.Sc4!
      • 1...a3+
        • 2.Qxa3#
      • 1...bxc4
        • 2.Qb6#
      • 1...c5
        • 2.Qa5#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(b);CHECK,OGATE::QAB1(D),XP(b)
    • P(e);N_GUARD::S(C)
  • Tries
    • Try
      • S(C);
      • Vars
        • P(b);CHECK,OGATE::QAB1(D),XP(b)
      • Refutation
        • P(e);
    • Try
      • S(C);
      • Vars
        • P(b);CHECK,OGATE::QAB1(D),XP(b)
      • Refutation
        • P(e);
    • Try
      • S(C);
      • Vars
        • P(b);CHECK,OGATE::QAB1(D),XP(b)
      • Refutation
        • P(e);
    • Try
      • S(C);
      • Vars
        • P(b);CHECK,OGATE::QAB1(D),XP(b)
      • Refutation
        • P(e);
    • Try
      • S(C);
      • Vars
        • P(b);CHECK,OGATE::QAB1(D),XP(b)
      • Refutation
        • P(e);
    • Try
      • Q(D);P_PINP(d)
      • Vars
        • P(e);N_GUARD::S(C)
      • Refutation
        • P(b);CHECK
    • Try
      • Q(D);
      • Vars
        • P(b);CHECK,OGATE::QAB1(D),XP(b)
        • P(e);N_GUARD,SBLOCK::S(C)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(D);
      • Vars
        • P(b);CHECK,OGATE::QAB1(D),XP(b)
        • P(e);N_GUARD,SBLOCK::S(C)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • P(B);
      • Vars
        • P(b);CHECK,OGATE::QAB1(D),XP(b)
      • Refutation
        • P(e);
  • Actual
    • S(C);
    • Vars
      • P(b);CHECK,OGATE::QAB1(D),XP(b)
      • P(d);OGATEB,XS(C)::QAR2(D)
      • P(e);SBLOCK::QAB1(D)
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).