MESON Chess Problem Database
Problem Display
PID: 265584 (qb4n1/8/p7/Q4p2/2P1kr2/1R6/K3b3/B7 w - - 0 1)
Keller, Michael
Die Schwalbe, 1972
#2
5 + 8
SOLUTION
- SOUND
- Sets
- 1...Qd5
- 2.Qxd5#
- 1...Qa7
- 2.Qd5#
- 1...Be5
- 2.Qxe5#
- 1...Ba7
- 2.Qe5#
- 1...Qd5
- Tries
- 1.Qd2?
- threat
- 2.Re3#
- 2.Qe3#
- 2.Qxe2#
- 2.Qd4#
- 1...Bxc4
- 2.Qd4#
- 1...Bd3
- 2.Qxd3#
- 1...Qd5
- 2.Re3#
- 2.Qe3#
- 2.Qxe2#
- 2.Qxd5#
- 1...Qa7
- 2.Qd5#
- 1...Rf1
- 2.Qe3#
- 2.Qd4#
- 1...Rf2
- 2.Qe3#
- 2.Qd4#
- 1...Rf3
- 2.Qd4#
- 1...Rg4
- 2.Qe3#
- 2.Qd4#
- 1...Rh4
- 2.Qe3#
- 2.Qd4#
- 1...Bd1
- 2.Re3#
- 2.Qe3#
- 2.Qd3#
- 2.Qd4#
- 1...Bf1
- 2.Re3#
- 2.Qe3#
- 2.Qd4#
- 1...Bf3
- 2.Re3#
- 2.Qe3#
- 2.Qc2#
- 2.Qd3#
- 2.Qd4#
- 1...Bg4
- 2.Re3#
- 2.Qe3#
- 2.Qc2#
- 2.Qd3#
- 2.Qd4#
- 1...Bh5
- 2.Re3#
- 2.Qe3#
- 2.Qc2#
- 2.Qd3#
- 2.Qd4#
- 1...Be5
- 2.Re3#
- 2.Qe3#
- 2.Qxe2#
- 1...Ba7!
- threat
- 1.Qc3?
- threat
- 2.Qd4#
- 2.Qe3#
- 1...Bxc4
- 2.Qd4#
- 2.Qxc4#
- 1...Rf3
- 2.Qd4#
- 1...Bd3
- 2.Qxd3#
- 1...Qd5
- 2.Qe3#
- 1...Be5
- 2.Qxe5#
- 2.Qe3#
- 1...Ba7
- 2.Qe5#
- 1...Qa7!
- threat
- 1.Qb6?
- threat
- 2.Re3#
- 2.Qe3#
- 2.Qd4#
- 1...Bxc4
- 2.Qd4#
- 1...Rf1
- 2.Qe3#
- 2.Qd4#
- 1...Rf2
- 2.Qe3#
- 2.Qd4#
- 1...Rf3
- 2.Qd4#
- 1...Rg4
- 2.Qe3#
- 2.Qd4#
- 1...Rh4
- 2.Qe3#
- 2.Qd4#
- 1...Qd5
- 2.Re3#
- 2.Qe3#
- 1...Qa7
- 2.Re3#
- 2.Qc6#
- 1...Be5
- 2.Re3#
- 2.Qe3#
- 1...Ba7
- 2.Re3#
- 2.Qe6#
- 1...Bd3!
- threat
- 1.Qc5?
- threat
- 2.Re3#
- 2.Qe3#
- 2.Qd4#
- 1...Bxc4
- 2.Qd4#
- 2.Qxc4#
- 1...Rf1
- 2.Qe3#
- 2.Qd4#
- 1...Rf2
- 2.Qe3#
- 2.Qd4#
- 1...Rf3
- 2.Qd4#
- 1...Rg4
- 2.Qe3#
- 2.Qd4#
- 1...Rh4
- 2.Qe3#
- 2.Qd4#
- 1...Qd5
- 2.Re3#
- 2.Qe3#
- 2.Qxd5#
- 1...Qa7
- 2.Re3#
- 2.Qd5#
- 2.Qc6#
- 1...Be5
- 2.Re3#
- 2.Qe3#
- 2.Qxe5#
- 1...Ba7
- 2.Re3#
- 2.Qe5#
- 1...Bd3!
- threat
- 1.Qd2?
- Keys
- 1.Qd8!
- threat
- 2.Qd4#
- 1...Bd3
- 2.Qxd3#
- 1...Qd5
- 2.Qxd5#
- 1...Qa7
- 2.Qd5#
- 1...Be5
- 2.Qxa8#
- 1...Bd6
- 2.Qxa8#
- 1...Ba7
- 2.Qxa8#
- threat
- 1.Qd8!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- Q(f);N_GUARD::QAB1(E),XQ(f)
- Q(f);N_GUARD::QAB1(E)
- B(g);N_GUARD::QAR1(E),XB(g)
- B(g);N_GUARD::QAR1(E)
- Tries
- Try
- Q(E);
- Threat
- DUALS(4)
- Vars
- B(a);P_PINR(C),XP(D)::QAR1(E)
- B(a);N_GUARD::QAB1(E),XB(a)
- Q(f);N_GUARD::QAB1(E)
- R(c);::QAR1(E)
- Refutation
- B(g);
- Try
- Q(E);
- Threat
- DUALS(2)
- Vars
- R(c);::QAR1(E)
- B(a);N_GUARD::QAB1(E),XB(a)
- Q(f);::QAR1(E)
- B(g);N_GUARD::QAR1(E)
- Refutation
- Q(f);
- Try
- Q(E);
- Threat
- DUALS(3)
- Vars
- B(a);P_PINR(C),XP(D)::QAR1(E)
- R(c);::QAR1(E)
- Refutation
- B(a);
- Try
- Q(E);
- Threat
- DUALS(3)
- Vars
- R(c);::QAR1(E)
- Refutation
- B(a);
- Try
- Actual
- Q(E);
- Threat
- QAR1(E)
- Vars
- B(a);N_GUARD::QAB1(E),XB(a)
- Q(f);N_GUARD::QAB1(E),XQ(f)
- Q(f);N_GUARD::QAB1(E)
- B(g);OGATE::QAB(E),XQ(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).