MESON Chess Problem Database
Problem Display
PID: 81182 (2Q5/5pB1/3R4/1P6/4kp2/1n2np2/5P2/7K w - - 0 1)
Allison, Christopher John
The Field, 1950
(First published on Sat Dec 2 1950)
#2
6 + 6
SOLUTION
- SOUND
- Sets
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sd4
- 2.Rxd4#
- 1...Sa5
- 2.Rd4#
- 1...Sc5
- 2.Rd4#
- 1...Sd1
- 2.Qc2#
- 1...Sf1
- 2.Qc2#
- 1...Sc2
- 2.Qxc2#
- 1...Sg2
- 2.Qc2#
- 1...Sg4
- 2.Qc2#
- 1...Sd5
- 2.Qc2#
- 1...Sf5
- 2.Qb7#
- 2.Qc2#
- 2.Qc6#
- 2.Qa8#
- 1...f5
- 2.Qe6#
- 2.Qe8#
- 1...f6
- 2.Qe6#
- 1...Sa1
- Tries
- 1.Kg1?
- 1...Sd4
- 2.Rxd4#
- 1...Sd5
- 2.Qc2#
- 1...f6
- 2.Qe6#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sa5
- 2.Rd4#
- 1...Sc5
- 2.Rd4#
- 1...Sd1
- 2.Qc2#
- 1...Sf1
- 2.Qc2#
- 1...Sc2
- 2.Qxc2#
- 1...Sg2
- 2.Qc2#
- 1...Sg4
- 2.Qc2#
- 1...Sf5
- 2.Qb7#
- 2.Qc2#
- 2.Qc6#
- 2.Qa8#
- 1...f5
- 2.Qe6#
- 2.Qe8#
- 1...Sc4!
- 1...Sd4
- 1.Bf6?
- 1...Sd4
- 2.Rxd4#
- 1...Sd5
- 2.Qc2#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sa5
- 2.Rd4#
- 1...Sc5
- 2.Rd4#
- 1...Sd1
- 2.Qc2#
- 1...Sf1
- 2.Qc2#
- 1...Sc2
- 2.Qxc2#
- 1...Sg2
- 2.Qc2#
- 1...Sg4
- 2.Qc2#
- 1...Sf5
- 2.Qb7#
- 2.Qc2#
- 2.Qc6#
- 2.Qa8#
- 1...Sc4!
- 1...Sd4
- 1.Bh8?
- 1...Sd4
- 2.Rxd4#
- 1...Sd5
- 2.Qc2#
- 1...f6
- 2.Qe6#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sa5
- 2.Rd4#
- 1...Sc5
- 2.Rd4#
- 1...Sd1
- 2.Qc2#
- 1...Sf1
- 2.Qc2#
- 1...Sc2
- 2.Qxc2#
- 1...Sg2
- 2.Qc2#
- 1...Sg4
- 2.Qc2#
- 1...Sf5
- 2.Qb7#
- 2.Qc2#
- 2.Qc6#
- 2.Qa8#
- 1...f5
- 2.Qe6#
- 2.Qe8#
- 1...Sc4!
- 1...Sd4
- 1.Rd8?
- 1...Sd4
- 2.Rxd4#
- 1...Sd5
- 2.Qc2#
- 1...f6
- 2.Qe6#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sa5
- 2.Rd4#
- 1...Sc5
- 2.Rd4#
- 1...Sd1
- 2.Qc2#
- 1...Sf1
- 2.Qc2#
- 1...Sc2
- 2.Qxc2#
- 1...Sg2
- 2.Qc2#
- 1...Sg4
- 2.Qc2#
- 1...Sf5
- 2.Qb7#
- 2.Qc2#
- 2.Qc6#
- 2.Qa8#
- 1...f5
- 2.Qe6#
- 1...Sc4!
- 1...Sd4
- 1.Qb7+?
- 1...Sd5
- 2.Qxd5#
- 1...Kf5!
- 1...Sd5
- 1.Qc6+?
- 1...Sd5
- 2.Qxd5#
- 2.Qc2#
- 1...Kf5!
- 1...Sd5
- 1.Qa8+?
- 1...Sd5
- 2.Qxd5#
- 1...Kf5!
- 1...Sd5
- 1.b6?
- 1...Sd4
- 2.Rxd4#
- 1...Sd5
- 2.Qc2#
- 1...f6
- 2.Qe6#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sa5
- 2.Rd4#
- 1...Sc5
- 2.Rd4#
- 1...Sd1
- 2.Qc2#
- 1...Sf1
- 2.Qc2#
- 1...Sc2
- 2.Qxc2#
- 1...Sg2
- 2.Qc2#
- 1...Sg4
- 2.Qc2#
- 1...Sf5
- 2.Qb7#
- 2.Qc2#
- 2.Qc6#
- 2.Qa8#
- 1...f5
- 2.Qe6#
- 2.Qe8#
- 1...Sc4!
- 1...Sd4
- 1.Kg1?
- Keys
- 1.Rd5!
- 1...Kxd5
- 2.Qc6#
- 1...Sxd5
- 2.Qc2#
- 1...Sd4
- 2.Rxd4#
- 1...Sc4
- 2.Qf5#
- 1...Sa1
- 2.Rd4#
- 1...Sc1
- 2.Rd4#
- 1...Sd2
- 2.Rd4#
- 1...Sa5
- 2.Rd4#
- 1...Sc5
- 2.Rd4#
- 1...Sd1
- 2.Qf5#
- 1...Sf1
- 2.Qf5#
- 1...Sc2
- 2.Qf5#
- 1...Sg2
- 2.Qf5#
- 1...Sg4
- 2.Qf5#
- 1...Sf5
- 2.Qxf5#
- 1...f5
- 2.Qe6#
- 1...f6
- 2.Qe6#
- 1...Kxd5
- 1.Rd5!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 5
- ADDED MATES = 4
- REMOVED MATES = 0
- Sets
- S(a);N_GUARD::R1(D)
- S(a);N_GUARD::R1(D),XS(a)
- S(b);N_GUARD::QAB(F)
- S(b);N_GUARD::QAB(F),XS(b)
- P(f);N_GUARD::QAR2(F)
- Tries
- Try
- K(A);P-FLIGHT
- Vars
- S(a);N_GUARD::R1(D),XS(a)
- S(b);N_GUARD::QAB(F)
- P(f);N_GUARD::QAR2(F)
- S(a);N_GUARD::R1(D)
- S(b);N_GUARD::QAB(F),XS(b)
- Refutation
- S(b);
- Try
- B(E);
- Vars
- S(a);N_GUARD::R1(D),XS(a)
- S(b);N_GUARD::QAB(F)
- S(a);N_GUARD::R1(D)
- S(b);N_GUARD::QAB(F),XS(b)
- Refutation
- S(b);
- Try
- B(E);
- Vars
- S(a);N_GUARD::R1(D),XS(a)
- S(b);N_GUARD::QAB(F)
- P(f);N_GUARD::QAR2(F)
- S(a);N_GUARD::R1(D)
- S(b);N_GUARD::QAB(F),XS(b)
- Refutation
- S(b);
- Try
- R(D);
- Vars
- S(a);N_GUARD::R1(D),XS(a)
- S(b);N_GUARD::QAB(F)
- P(f);N_GUARD::QAR2(F)
- S(a);N_GUARD::R1(D)
- S(b);N_GUARD::QAB(F),XS(b)
- Refutation
- S(b);
- Try
- Q(F);CHECK
- Vars
- S(b);N_GUARD,P_SPINS(b)::QAB1(F),XS(b)
- Refutation
- K(d);S_FLIGHT
- Try
- Q(F);CHECK
- Refutation
- K(d);S_FLIGHT
- Try
- Q(F);CHECK
- Vars
- S(b);N_GUARD,P_SPINS(b)::QAB1(F),XS(b)
- Refutation
- K(d);S_FLIGHT
- Try
- P(C);
- Vars
- S(a);N_GUARD::R1(D),XS(a)
- S(b);N_GUARD::QAB(F)
- P(f);N_GUARD::QAR2(F)
- S(a);N_GUARD::R1(D)
- S(b);N_GUARD::QAB(F),XS(b)
- Refutation
- S(b);
- Try
- Actual
- R(D);
- Vars
- K(d);OGATEB,S_FLIGHT,XR(D)::QAB1(F)
- S(b);N_GUARD,SBLOCK,XR(D)::QAB(F)
- S(a);N_GUARD::R1(D),XS(a)
- S(b);N_GUARD::QAB1(F)
- S(a);N_GUARD::R1(D)
- S(b);N_GUARD::QAB1(F),XS(b)
- P(f);N_GUARD::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).