MESON Chess Problem Database
Problem Display
PID: 506 (7r/bR3Bqp/1P1k1n1N/R2P1p1p/5P1Q/2Npr2b/1KP3p1/6B1 w - - 0 1)
Nicklin, John Joseph
The Observer, 1957
#2
12 + 12
SOLUTION
- SOUND
- Sets
- 1...Qxf7
- 2.Sxf7#
- 1...Re1
- 2.Sb5#
- 2.Bc5#
- 1...Re2
- 2.Sb5#
- 2.Bc5#
- 1...Rf3
- 2.Sb5#
- 2.Bc5#
- 1...Rg3
- 2.Sb5#
- 2.Bc5#
- 1...Re4
- 2.Sb5#
- 2.Bc5#
- 1...Re5
- 2.Sb5#
- 2.Bc5#
- 1...Re6
- 2.Bc5#
- 1...Re7
- 2.Sb5#
- 2.Bc5#
- 1...Ree8
- 2.Sb5#
- 2.Bc5#
- 1...Se4
- 2.Qe7#
- 1...Sg4
- 2.Sxf5#
- 1...Se8
- 2.Qd8#
- 1...Sg8
- 2.Qd8#
- 1...Qxf7
- Tries
- 1.Qxf6+?
- 1...Re6
- 2.Bc5#
- 2.Qxe6#
- 1...Qxf6!
- 1...Re6
- 1.Qxf6+?
- Keys
- 1.Rc7!
- threat
- 2.Sb5#
- 1...Qxf7
- 2.Sxf7#
- 1...Sxd5
- 2.Rxd5#
- 1...Re6
- 2.Bc5#
- 1...Se4
- 2.Qe7#
- 1...Sg4
- 2.Sxf5#
- 1...Sd7
- 2.Rc6#
- 1...Se8
- 2.Qd8#
- 1...Sg8
- 2.Qd8#
- threat
- 1.Rc7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- Q(j);XB(L)::S(J),XQ(j)
- R(c);OGATE::B(A)
- S(h);OGATE,P_PINS(D)::QAB1(F)
- S(h);P_PINS(D),S_CUTB(d)::S(J),XP(e)
- S(h);OGATE,P_PINS(D)::QAR2(F)
- Tries
- Try
- Q(F);CHECK,XS(h)
- Refutation
- Q(j);P_PINS(D),XQ(F)
- Try
- Actual
- R(K);
- Threat
- S(D)
- Vars
- Q(j);XB(L)::S(J),XQ(j)
- S(h);OGATE,P_PINS(D),XP(H)::R1(G),XS(h)
- R(c);OGATE::B(A)
- S(h);OGATE,P_PINS(D)::QAB1(F)
- S(h);P_PINS(D),S_CUTB(d)::S(J),XP(e)
- S(h);P_PINS(D),SBLOCK::R1(K)
- S(h);OGATE,P_PINS(D)::QAR2(F)
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).