MESON Chess Problem Database
Problem Display
PID: 568 (4N3/1r1p1np1/2b1p3/1prk4/n1RP2p1/1p4N1/1P6/3R1Q1K w - - 0 1)
Langstaff, William A
The Observer, 1965
#2
8 + 12
SOLUTION
- SOUND
- Sets
- 1...Rxc4
- 2.Qg2#
- 1...Sxb2
- 2.Rxc5#
- 1...Sc3
- 2.Rxc5#
- 1...Sb6
- 2.Rxc5#
- 1...bxc4
- 2.Qg2#
- 1...e5
- 2.Qxf7#
- 1...Rxc4
- Tries
- 1.Qe2?
- threat
- 2.dxc5#
- 1...Rxc4
- 2.Qg2#
- 2.Qe4#
- 1...Sxb2
- 2.Rxc5#
- 1...bxc4
- 2.Qg2#
- 2.Qe4#
- 1...Sc3
- 2.Rxc5#
- 1...Se5
- 2.dxe5#
- 1...e5!
- threat
- 1.Qe2?
- Keys
- 1.Qf4!
- threat
- 2.dxc5#
- 1...Kxc4+
- 2.d5#
- 1...Rxc4
- 2.Qe4#
- 1...Sxb2
- 2.Rxc5#
- 1...bxc4
- 2.Qe4#
- 1...e5
- 2.Qxf7#
- 1...Sc3
- 2.Rxc5#
- 1...Se5
- 2.dxe5#
- threat
- 1.Qf4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 2
- REMOVED MATES = 1
- Sets
- R(e);SBLOCK,XR(F)::QAB(B)
- S(b);N_GUARD,XP(D)::R1(F),XR(e)
- S(b);N_GUARD::R1(F),XR(e)
- P(d);SBLOCK,XR(F)::QAB(B)
- P(h);OGATEB::QAB(B),XS(k)
- Tries
- Try
- Q(B);
- Threat
- R(A)+P(G),XR(e)
- Vars
- S(b);N_GUARD,XP(D)::R1(F),XR(e)
- S(b);N_GUARD::R1(F),XR(e)
- S(k);OGATE::R(A)+P(G),XS(k)
- Refutation
- P(h);
- Try
- Actual
- Q(B);
- Threat
- R(A)+P(G),XR(e)
- Vars
- K(f);CHECK,OGATE,S_FLIGHT,XR(F)::QAR(B)+P(G)
- R(e);SBLOCK,XR(F)::QAB1(B)
- S(b);N_GUARD,XP(D)::R1(F),XR(e)
- P(d);SBLOCK,XR(F)::QAB1(B)
- P(h);OGATEB::QAB(B),XS(k)
- S(b);N_GUARD::R1(F),XR(e)
- S(k);OGATE::R(A)+P(G),XS(k)
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).