MESON Chess Problem Database
Problem Display
PID: 159006 (Kb4B1/4n3/1p2R3/pQpk1rRN/2n5/pN1b1P2/3pr3/q5B1 w - - 0 1)
Sydenham, Colin Peter
The Problemist, 1975
#2
9 + 13
| 15513 | Selected Chess Problems of Colin Sydenham | 2015 |
SOLUTION
- SOUND
- Sets
- 1...Qf6
- 2.Sxf6#
- 1...Qb1
- 2.Sf6#
- 1...Qc1
- 2.Sf6#
- 1...Qd1
- 2.Sf6#
- 1...Qe1
- 2.Sf6#
- 1...Qf1
- 2.Sf6#
- 1...Qxg1
- 2.Sf6#
- 1...Qa2
- 2.Sf6#
- 1...Re5
- 2.Sf4#
- 2.Sf6#
- 1...Bf4
- 2.Sxf4#
- 1...Ba7
- 2.Sf4#
- 1...Sb2
- 2.Sf6#
- 1...Sd6
- 2.Sf4#
- 1...Sc6
- 2.Qxc6#
- 1...Sg6
- 2.Qc6#
- 1...Sc8
- 2.Qc6#
- 1...Sxg8
- 2.Qc6#
- 1...Qf6
- Tries
- 1.Rxf5+?
- 1...Qe5
- 2.Sf4#
- 2.Sf6#
- 1...Re5
- 2.Sf4#
- 2.Sf6#
- 1...Be5
- 2.Sf4#
- 2.Sf6#
- 1...Se5
- 2.Sf4#
- 2.Sf6#
- 1...Sxf5
- 2.Qc6#
- 1...Bxf5!
- 1...Qe5
- 1.Rxb6+?
- 1...Re6
- 2.Qxc5#
- 1...Sxg8
- 2.Qxc5#
- 1...Ke5!
- 1...Re6
- 1.Rxe7+?
- 1...Kd6
- 2.Qd7#
- 1...Re6!
- 1...Kd6
- 1.Qd7+?
- 1...Bd6
- 2.Sf4#
- 1...Sd6!
- 1...Bd6
- 1.Rxf5+?
- Keys
- 1.Bxc5!
- threat
- 2.Bg1#
- 2.Bf2#
- 2.Bxa3#
- 2.Be3#
- 2.Bb4#
- 2.Bd4#
- 2.Bxb6#
- 2.Bd6#
- 2.Bxe7#
- 1...Rxe6
- 2.Bxa3#
- 2.Bb4#
- 2.Bxe7#
- 1...Sxg8
- 2.Qc6#
- 1...bxc5
- 2.Qxc5#
- 1...Qd4
- 2.Bxd4#
- 1...Qg1
- 2.Sf6#
- 2.Bxg1#
- 2.Bf2#
- 2.Be3#
- 2.Bd4#
- 1...Rf2
- 2.Bxf2#
- 2.Bxa3#
- 2.Be3#
- 2.Bb4#
- 2.Bd4#
- 2.Bxb6#
- 2.Bd6#
- 2.Bxe7#
- 2.Rxe7#
- 1...Re3
- 2.Bxa3#
- 2.Bxe3#
- 2.Bb4#
- 2.Bd4#
- 2.Bxb6#
- 2.Bd6#
- 2.Bxe7#
- 1...Bd6
- 2.Bxd6#
- 1...Sb2
- 2.Sf6#
- 1...Se3
- 2.Rxe7#
- 1...Se5
- 2.Rd6#
- 1...Sd6
- 2.Sf4#
- 1...Sc6
- 2.Bg1#
- 2.Bf2#
- 2.Bxa3#
- 2.Be3#
- 2.Bb4#
- 2.Bd4#
- 2.Bxb6#
- 2.Bd6#
- 2.Be7#
- 2.Bf8#
- 2.Rxe2#
- 2.Re3#
- 2.Re4#
- 2.Qxc6#
- 1...Sg6
- 2.Bg1#
- 2.Bf2#
- 2.Bxa3#
- 2.Be3#
- 2.Bb4#
- 2.Bd4#
- 2.Bxb6#
- 2.Bd6#
- 2.Be7#
- 2.Bf8#
- 2.Rxe2#
- 2.Re3#
- 2.Re4#
- 2.Qc6#
- 1...Sc8
- 2.Bg1#
- 2.Bf2#
- 2.Bxa3#
- 2.Be3#
- 2.Bb4#
- 2.Bd4#
- 2.Bxb6#
- 2.Bd6#
- 2.Be7#
- 2.Bf8#
- 2.Rxe2#
- 2.Re3#
- 2.Re4#
- 2.Qc6#
- 1...a2
- 2.Bg1#
- 2.Bf2#
- 2.Ba3#
- 2.Be3#
- 2.Bb4#
- 2.Bd4#
- 2.Bxb6#
- 2.Bd6#
- 2.Bxe7#
- threat
- 1.Bxc5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 13
- Sets
- Q(a);N_GUARD::S(F),XQ(a)
- Q(a);N_GUARD::S(F)
- Q(a);N_GUARD,XB(A)::S(F)
- B(m);N_GUARD::S(F),XB(m)
- B(m);N_GUARD::S(F)
- S(f);S_CUTQ(a)::S(F)
- S(f);S_CUTB(m)::S(F)
- S(l);N_GUARD::QAB1(D),XS(l)
- S(l);N_GUARD::QAB1(D)
- S(l);N_GUARD,XB(I)::QAB1(D)
- Tries
- Try
- R(E);CHECK,XR(j)
- Vars
- S(l);XR(E)::QAB1(D)
- Refutation
- B(e);XR(E)
- Try
- R(G);CHECK,XP(k)
- Vars
- R(c);::QAR1(D),XP(h)
- S(l);XB(I)::QAR1(D),XP(h)
- Refutation
- K(i);P-FLIGHT
- Try
- R(G);CHECK,XS(l)
- Vars
- K(i);N_SPINP(h),N_SPINR(j),P-FLIGHT::QAR1(D)
- Refutation
- R(c);
- Try
- Q(D);CHECK,N_PINP(h)
- Vars
- B(m);P_SPINB(m)::S(F)
- Refutation
- S(f);P_SPINS(f)
- Try
- Actual
- B(A);XP(h)
- Threat
- DUALS(9)
- Vars
- S(l);N_GUARD,XB(I)::QAB1(D)
- P(k);OGATE,P_SPINP(k),XB(A)::QAR1(D),XP(k)
- Q(a);::QAR(D)+B(A),XQ(a)
- B(m);::QAR(D)+B(A),XB(m)
- S(f);S_CUTQ(a)::S(F)
- S(f);S_CUTR(c)::B(I)+R(G),XS(l)
- S(f);N_SPINR(j),SBLOCK::B(I)+R(G),DCHECK
- S(f);S_CUTB(m)::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).