MESON Chess Problem Database
Problem Display
PID: 49613 (8/8/8/2K2N2/p7/pk2N3/3Qn3/n7 w - - 0 1)
Lester, William Edward
The Problemist, 1930
#2
4 + 5
SOLUTION
- SOUND
- Sets
- 1...Sc2
- 2.Qxc2#
- 1...Sc1
- 2.Sd4#
- 1...Sg1
- 2.Sd4#
- 1...Sc3
- 2.Sd4#
- 1...Sg3
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...Sf4
- 2.Sd4#
- 1...a2
- 2.Qb4#
- 1...Sc2
- Tries
- 1.Kb5?
- 1...Sd4+
- 2.Sxd4#
- 1...Sc2
- 2.Qxc2#
- 1...a2
- 2.Qb4#
- 1...Sc1
- 2.Sd4#
- 1...Sg1
- 2.Sd4#
- 1...Sg3
- 2.Sd4#
- 1...Sf4
- 2.Sd4#
- 1...Sc3+!
- 1...Sd4+
- 1.Sc4?
- threat
- 2.Sa5#
- 1...a2
- 2.Qb2#
- 1...Sc2!
- threat
- 1.Kb5?
- Keys
- 1.Sd1!
- 1...Sc2
- 2.Qd5#
- 1...a2
- 2.Qb2#
- 1...Sc1
- 2.Sd4#
- 1...Sg1
- 2.Sd4#
- 1...Sc3
- 2.Sd4#
- 1...Sg3
- 2.Sd4#
- 1...Sd4
- 2.Sxd4#
- 1...Sf4
- 2.Sd4#
- 1...Sc2
- 1.Sd1!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- S(a);N_GUARD::QAB1(A),XS(a)
- S(b);N_GUARD::S(D)
- S(b);N_GUARD::S(D),XS(b)
- P(c);SBLOCK::QAR1(A)
- Tries
- Try
- K(C);P-FLIGHT
- Vars
- S(b);CHECK,N_GUARD::S(D),XS(b)
- S(a);N_GUARD::QAB1(A),XS(a)
- P(c);SBLOCK::QAR1(A)
- S(b);N_GUARD::S(D)
- Refutation
- S(b);CHECK
- Try
- S(B);
- Threat
- S(B)
- Vars
- P(c);N_GUARD::QAR1(A)
- Refutation
- S(a);
- Try
- Actual
- S(B);
- Vars
- S(a);SBLOCK::QAB(A)
- P(c);N_GUARD::QAR1(A)
- S(b);N_GUARD::S(D)
- S(b);N_GUARD::S(D),XS(b)
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).