MESON Chess Problem Database
Problem Display
PID: 199420 (5b1K/2qp2p1/8/1Q6/1N1kN3/4R2p/b7/1rB2r1n w - - 0 1)
Lertoria, Ernest
The Observer, 1945
(First published on Sun Apr 22 1945)
#2
6 + 10
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Qg3
- 2.Sc2#
- 1...Qf4
- 2.Sc2#
- 1...Qa5
- 2.Sc2#
- 1...Qe5
- 2.Sc2#
- 2.Qd3#
- 1...Qb6
- 2.Sc2#
- 1...Qd6
- 2.Sc2#
- 1...Qb8
- 2.Sc2#
- 1...Qd8
- 2.Sc2#
- 1...Qc2
- 2.Sxc2#
- 1...Qa7
- 2.Sc2#
- 1...Qb7
- 2.Sc2#
- 1...Rb3
- 2.Qd5#
- 1...Bc4
- 2.Sc2#
- 1...Bd5
- 2.Qxd5#
- 1...Qg3
- Tries
- 1.Sc3?
- threat
- 2.Se2#
- 2.Sc2#
- 2.Rd3#
- 1...Rbxc1
- 2.Rd3#
- 1...Rxb4
- 2.Se2#
- 2.Rd3#
- 1...Rfxc1
- 2.Rd3#
- 1...Bxb4
- 2.Se2#
- 2.Rd3#
- 1...Qh2
- 2.Rd3#
- 1...Qg3
- 2.Se2#
- 2.Sc2#
- 1...Qc4
- 2.Sc2#
- 2.Qe5#
- 1...Qc5
- 2.Se2#
- 2.Sc2#
- 2.Qd3#
- 1...Rb2
- 2.Rd3#
- 1...Rd1
- 2.Se2#
- 2.Sc2#
- 1...Re1
- 2.Sc2#
- 2.Rd3#
- 1...Rf2
- 2.Rd3#
- 1...Rf3
- 2.Se2#
- 2.Sc2#
- 1...Bb3
- 2.Se2#
- 2.Rd3#
- 1...Bc4
- 2.Sc2#
- 1...Bd5
- 2.Se2#
- 2.Sc2#
- 2.Qxd5#
- 1...Bc5
- 2.Se2#
- 2.Sc2#
- 2.Qd3#
- 1...Sf2
- 2.Se2#
- 2.Sc2#
- 1...Sg3
- 2.Sc2#
- 2.Rd3#
- 1...d5
- 2.Se2#
- 2.Sc2#
- 1...Qxc3!
- threat
- 1.Sg3?
- threat
- 2.Se2#
- 2.Rd3#
- 1...Qxg3
- 2.Sc2#
- 1...Qxc1
- 2.Rd3#
- 1...Rbxc1
- 2.Rd3#
- 1...Rfxc1
- 2.Sf5#
- 2.Rd3#
- 1...Qc2
- 2.Sxc2#
- 1...Qc3
- 2.Se2#
- 2.Re4#
- 1...Qc4
- 2.Qe5#
- 1...Qc5
- 2.Se2#
- 2.Qd3#
- 1...Rb2
- 2.Rd3#
- 1...Rb3
- 2.Se2#
- 2.Qd5#
- 1...Rd1
- 2.Se2#
- 2.Sf5#
- 1...Re1
- 2.Sf5#
- 2.Rd3#
- 1...Rf2
- 2.Rd3#
- 1...Rf3
- 2.Se2#
- 1...Bc4
- 2.Sc2#
- 1...Bd5
- 2.Se2#
- 2.Qxd5#
- 1...Bc5
- 2.Se2#
- 2.Qd3#
- 1...Sf2
- 2.Se2#
- 2.Sf5#
- 1...d5
- 2.Se2#
- 1...Sxg3!
- threat
- 1.Sd6?
- threat
- 2.Rd3#
- 2.Qe5#
- 1...Qxd6
- 2.Sc2#
- 1...Qa5
- 2.Sc2#
- 2.Rd3#
- 1...Qc2
- 2.Sxc2#
- 2.Qe5#
- 1...Qc3
- 2.Re4#
- 2.Qe5#
- 1...Qc4
- 2.Qe5#
- 1...Qc5
- 2.Qd3#
- 1...Rb3
- 2.Qd5#
- 2.Qe5#
- 1...Rd1
- 2.Sf5#
- 2.Qe5#
- 1...Rf3
- 2.Qe5#
- 1...Rf5
- 2.Sxf5#
- 2.Rd3#
- 1...Bc4
- 2.Sc2#
- 2.Qe5#
- 1...Bd5
- 2.Qxd5#
- 1...Sf2
- 2.Sf5#
- 2.Qe5#
- 1...Bxd6!
- threat
- 1.Sc3?
- Keys
- 1.Sg5!
- threat
- 2.Rd3#
- 1...Qg3
- 2.Sc2#
- 1...Qc2
- 2.Sxc2#
- 1...Qc3
- 2.Re4#
- 1...Qc4
- 2.Qe5#
- 1...Qc5
- 2.Qd3#
- 1...Rb3
- 2.Qd5#
- 1...Rd1
- 2.Sf3#
- 1...Rf3
- 2.Sxf3#
- 1...Bc4
- 2.Sc2#
- 1...Bd5
- 2.Qxd5#
- 1...Bc5
- 2.Qd3#
- 1...Sf2
- 2.Sf3#
- 1...d5
- 2.Se6#
- threat
- 1.Sg5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 8
- REMOVED MATES = 8
- Sets
- Q(g);N_GUARD::S(C)
- Q(g);N_GUARD::S(C),XQ(g)
- R(a);S_CUTB(d)::QAR1(E)
- B(d);S_CUTQ(g)::S(C)
- B(d);N_GUARD::QAR1(E),XB(d)
- Tries
- Try
- S(D);
- Threat
- DUALS(3)
- Vars
- R(a);XB(A)::R1(B)
- R(b);XB(A)::R1(B)
- Q(g);::R1(B)
- R(a);::R1(B)
- R(b);::R1(B)
- B(d);::S(C)
- Refutation
- Q(g);XS(D)
- Try
- S(D);
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD,XS(D)::S(C)
- Q(g);XB(A)::R1(B)
- R(a);XB(A)::R1(B)
- Q(g);N_GUARD::S(C),XQ(g)
- Q(g);N_GUARD,SBLOCK::QAB1(E)
- R(a);::R1(B)
- R(b);::R1(B)
- R(b);::S(D)
- B(d);S_CUTQ(g)::S(C)
- P(h);::S(D)
- Refutation
- S(c);XS(D)
- Try
- S(D);
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD,XS(D)::S(C)
- Q(g);::QAB1(E)
- Q(g);SBLOCK::QAR1(E)
- R(b);::QAB1(E)
- B(d);N_GUARD::QAR1(E),XB(d)
- Refutation
- B(j);XS(D)
- Try
- Actual
- S(D);
- Threat
- R1(B)
- Vars
- Q(g);N_GUARD::S(C)
- Q(g);N_GUARD::S(C),XQ(g)
- Q(g);SBLOCK::R1(B)
- Q(g);N_GUARD,SBLOCK::QAB1(E)
- Q(g);SBLOCK::QAR1(E)
- R(a);S_CUTB(d)::QAR1(E)
- R(b);N_GUARD::S(D)
- R(b);N_GUARD::S(D),XR(b)
- B(d);S_CUTQ(g)::S(C)
- B(d);N_GUARD::QAR1(E),XB(d)
- B(j);SBLOCK::QAR1(E)
- S(c);S_CUTR(b)::S(D)
- P(h);N_GUARD,S_CUTB(d)::S(D)
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).