MESON Chess Problem Database
Problem Display
PID: 107809 (KN6/8/Q7/1B6/Pk2NR2/r1q4R/1PPr4/1n2B3 w - - 0 1)
Braithwaite, Kenneth Holmes
Canadian Chess Chat, 1981
#2
11 + 5
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Qxb2
- 2.Sc6#
- 1...Qd4
- 2.Sc6#
- 1...Qe5
- 2.Sc6#
- 1...Qg7
- 2.Sc6#
- 1...Qb3
- 2.Sc6#
- 1...Qd3
- 2.Sc6#
- 1...Qe3
- 2.Sc6#
- 1...Qf3
- 2.Sc6#
- 1...Qg3
- 2.Sc6#
- 1...Qxh3
- 2.Sc6#
- 1...Qc6+
- 2.Sxc6#
- 1...Rd1
- 2.Sc6#
- 1...Re2
- 2.Sc6#
- 1...Rf2
- 2.Sc6#
- 1...Rg2
- 2.Sc6#
- 1...Rh2
- 2.Sc6#
- 1...Rd3
- 2.Sc6#
- 1...Rd4
- 2.Sc6#
- 1...Rd5
- 2.Sc6#
- 1...Rd7
- 2.Sc6#
- 1...Rxa4
- 2.Qxa4#
- 1...Qxb2
- Tries
- 1.Sxd2+?
- 1...Kc5
- 2.Qc6#
- 1...Qc4
- 2.Rxc4#
- 1...Qd4!
- 1...Kc5
- 1.Sf2+?
- 1...Kc5
- 2.Qc6#
- 1...Qc4
- 2.Rxc4#
- 1...Rd4
- 2.Sd3#
- 1...Qd4!
- 1...Kc5
- 1.Sxc3+?
- 1...Kc5
- 2.Rc4#
- 2.Qc6#
- 2.b4#
- 1...Rd4!
- 1...Kc5
- 1.Sc5+?
- 1...Kxc5
- 2.Qc6#
- 1...Qc4
- 2.Rxc4#
- 1...Rd4
- 2.Sd3#
- 1...Qd4!
- 1...Kxc5
- 1.Bc4?
- threat
- 2.Sc6#
- 2.Qb5#
- 1...Rxa4
- 2.Sc6#
- 1...Qe5
- 2.Sc6#
- 1...Qf6
- 2.Qb5#
- 1...Qh8
- 2.Qb5#
- 1...Rd5
- 2.Sc6#
- 1...Rd6
- 2.Qb5#
- 1...Rd8
- 2.Qb5#
- 1...Qxc4!
- threat
- 1.Rxc3?
- threat
- 2.Sxd2#
- 2.Sc6#
- 2.Rc4#
- 1...Rxc2
- 2.Sd2#
- 2.Sf2#
- 2.Sg3#
- 2.Sc5#
- 2.Sg5#
- 2.Sd6#
- 2.Sf6#
- 2.Sc6#
- 1...Sxc3
- 2.Sc6#
- 1...Rd1
- 2.Sd2#
- 2.Sc6#
- 2.Rb3#
- 2.Rc4#
- 1...Re2
- 2.Sc6#
- 2.Rb3#
- 2.Rc4#
- 1...Rf2
- 2.Sxf2#
- 2.Sc6#
- 2.Rb3#
- 2.Rc4#
- 1...Rg2
- 2.Sd2#
- 2.Sf2#
- 2.Sg3#
- 2.Sc5#
- 2.Sg5#
- 2.Sd6#
- 2.Sf6#
- 2.Sc6#
- 2.Rb3#
- 2.Rc4#
- 1...Rh2
- 2.Sd2#
- 2.Sf2#
- 2.Sg3#
- 2.Sc5#
- 2.Sg5#
- 2.Sd6#
- 2.Sf6#
- 2.Sc6#
- 2.Rb3#
- 2.Rc4#
- 1...Rd3
- 2.Sc6#
- 2.Rb3#
- 2.Rc4#
- 1...Rd4
- 2.Sc6#
- 2.Rb3#
- 2.Rc4#
- 1...Rd5
- 2.Sc6#
- 2.Rb3#
- 2.Rc4#
- 1...Rd6
- 2.Sxd6#
- 2.Rb3#
- 2.Rc4#
- 1...Rd7
- 2.Sd6#
- 2.Sc6#
- 2.Rb3#
- 2.Rc4#
- 1...Rd8
- 2.Sd6#
- 2.Rb3#
- 2.Rc4#
- 1...Rxc3!
- threat
- 1.bxc3+?
- 1...Sxc3
- 2.Sc6#
- 1...Rxc3!
- 1...Sxc3
- 1.Sxd2+?
- Keys
- 1.Qb6!
- threat
- 2.Sa6#
- 1...Qc6+
- 2.Sxc6#
- 1...Rxa4+
- 2.Ba6#
- 1...Rxc2
- 2.Sc5#
- 1...Qh8
- 2.Sf6#
- 1...Qc8
- 2.Sc5#
- 1...Rd8
- 2.Sd6#
- threat
- 1.Qb6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 4
- REMOVED MATES = 19
- Sets
- Q(d);N_GUARD,P_SPINR(b),XP(B)::S(K)
- Q(d);N_GUARD,P_SPINR(b)::S(K)
- Q(d);N_GUARD,P_PINS(F),P_SPINR(b)::S(K)
- Q(d);N_GUARD,P_SPINR(b),XR(D)::S(K)
- Q(d);CHECK,N_GUARD,P_SPINR(b)::S(K),XQ(d)
- R(b);P_SPINQ(d)::S(K)
- R(c);OGATE,P_PINQ(I),XP(E)::QAR1(I),XR(c)
- Tries
- Try
- S(F);CHECK,XR(b)
- Vars
- K(e);S_FLIGHT::QAR1(I)
- Q(d);N_GUARD,P_SPINQ(d)::R1(G),XQ(d)
- Refutation
- Q(d);P_SPINQ(d)
- Try
- S(F);CHECK
- Vars
- K(e);S_FLIGHT::QAR1(I)
- Q(d);N_GUARD,P_SPINQ(d),P_SPINR(b)::R1(G),XQ(d)
- R(b);P_SPINQ(d),P_SPINR(b)::S(F)
- Refutation
- Q(d);P_SPINQ(d),P_SPINR(b)
- Try
- S(F);CHECK,XQ(d)
- Refutation
- R(b);P_SPINR(b)
- Try
- S(F);CHECK
- Vars
- K(e);S_FLIGHT,XS(F)::QAR1(I)
- Q(d);N_GUARD,P_SPINQ(d),P_SPINR(b)::R1(G),XQ(d)
- R(b);P_SPINQ(d),P_SPINR(b)::S(F)
- Refutation
- Q(d);P_SPINQ(d),P_SPINR(b)
- Try
- B(H);
- Threat
- DUALS(2)
- Vars
- R(c);P_PINQ(I),XP(E)::S(K)
- Q(d);P_SPINR(b)::S(K)
- Q(d);P_SPINR(b)::QAR1(I)
- Q(d);P_PINS(K),P_SPINR(b)::QAR1(I)
- R(b);P_SPINQ(d)::S(K)
- R(b);P_SPINQ(d)::QAR1(I)
- R(b);P_PINS(K),P_SPINQ(d)::QAR1(I)
- Refutation
- Q(d);P_SPINR(b),XB(H)
- Try
- R(D);XQ(d)
- Threat
- DUALS(3)
- Vars
- S(a);XR(D)::S(K)
- Refutation
- R(c);XR(D)
- Try
- P(B);CHECK,XQ(d)
- Vars
- S(a);XP(B)::S(K)
- Refutation
- R(c);XP(B)
- Try
- Actual
- Q(I);P_SPINP(E)
- Threat
- S(K)
- Vars
- Q(d);CHECK,N_GUARD,P_SPINR(b)::S(K),XQ(d)
- R(c);CHECK,SBLOCK,XP(E)::QAR(I)+B(H)
- R(b);N_GUARD,P_SPINQ(d),XP(C)::R(G)+S(F)
- Q(d);N_GUARD,P_PINS(K),P_SPINR(b)::R(G)+S(F)
- R(b);N_GUARD,P_PINS(K),P_SPINQ(d)::R(G)+S(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).