MESON Chess Problem Database
Problem Display
PID: 196507 (2b3QK/1pn1p3/1r5p/Np6/1PPk2pN/R5P1/B1p1Rp2/2Brb3 w - - 0 1)
Sher, H
The Observer, 1943
(First published on Sun Aug 1 1943)
#2
11 + 13
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Rd2
- 2.Bb2#
- 1...Re6
- 2.Sf5#
- 1...Bf5
- 2.Sxf5#
- 1...Be6
- 2.Qg7#
- 1...Sd5
- 2.Qxd5#
- 1...Sa6
- 2.Qd5#
- 1...Se6
- 2.Sf5#
- 1...Sa8
- 2.Qd5#
- 1...Se8
- 2.Qd5#
- 1...bxc4
- 2.Qxc4#
- 1...e6
- 2.Qxg4#
- 1...Rd2
- Tries
- 1.Sb3+?
- 1...Kd3
- 2.Re3#
- 1...Kc3!
- 1...Kd3
- 1.Be3+?
- 1...Ke4
- 2.Bxf2#
- 2.Bc5#
- 2.Bxb6#
- 1...Ke5!
- 1...Ke4
- 1.Rae3?
- threat
- 2.Sb3#
- 1...bxc4
- 2.Qxc4#
- 1...Re6
- 2.Sf5#
- 1...Be6
- 2.Qg7#
- 1...Sd5
- 2.Qxd5#
- 1...Se6
- 2.Sf5#
- 1...e6
- 2.Qxg4#
- 1...Rd3!
- threat
- 1.Qe6?
- threat
- 2.Sf5#
- 2.Be3#
- 2.Re4#
- 2.Qe3#
- 2.Qe4#
- 2.Qe5#
- 2.Qxb6#
- 1...Rxc1
- 2.Sf5#
- 2.Re4#
- 2.Qe3#
- 2.Qe4#
- 2.Qe5#
- 2.Qxb6#
- 1...Rxe6
- 2.Sf5#
- 1...Bxb4
- 2.Be3#
- 2.Qe3#
- 2.Qe5#
- 1...Sxe6
- 2.Sf5#
- 1...bxc4
- 2.Sf5#
- 2.Be3#
- 2.Re4#
- 2.Qxc4#
- 2.Qe4#
- 2.Qe5#
- 1...Bc3
- 2.Qe3#
- 2.Qe4#
- 1...f1Q
- 2.Be3#
- 2.Re4#
- 2.Qe3#
- 2.Qe4#
- 2.Qe5#
- 2.Qxb6#
- 1...f1S
- 2.Sf5#
- 2.Re4#
- 2.Qe4#
- 2.Qe5#
- 2.Qxb6#
- 1...f1R
- 2.Be3#
- 2.Re4#
- 2.Qe3#
- 2.Qe4#
- 2.Qe5#
- 2.Qxb6#
- 1...Rd2
- 2.Sf5#
- 2.Bb2#
- 2.Re4#
- 2.Qe3#
- 2.Qe4#
- 2.Qe5#
- 2.Qxb6#
- 1...Rd3
- 2.Sf5#
- 2.Re4#
- 2.Qe4#
- 2.Qe5#
- 2.Qxb6#
- 1...Ra6
- 2.Sf5#
- 2.Be3#
- 2.Re4#
- 2.Qe3#
- 2.Qe4#
- 2.Qe5#
- 1...Rc6
- 2.Sf5#
- 2.Be3#
- 2.Re4#
- 2.Qe3#
- 2.Qe4#
- 2.Qe5#
- 1...Rd6
- 2.Sf5#
- 2.Be3#
- 2.Re4#
- 2.Qe3#
- 2.Qe4#
- 2.Qe5#
- 1...Bd2
- 2.Sf5#
- 2.Re4#
- 2.Qe4#
- 2.Qe5#
- 2.Qxb6#
- 1...Sd5
- 2.Sf5#
- 2.Re4#
- 2.Qxd5#
- 2.Qe4#
- 2.Qe5#
- 1...Sa6
- 2.Sf5#
- 2.Be3#
- 2.Re4#
- 2.Qd5#
- 2.Qe3#
- 2.Qe4#
- 2.Qe5#
- 1...Sa8
- 2.Sf5#
- 2.Be3#
- 2.Re4#
- 2.Qd5#
- 2.Qe3#
- 2.Qe4#
- 2.Qe5#
- 1...Bxe6!
- threat
- 1.Qg5?
- threat
- 2.Qe3#
- 2.Qf4#
- 2.Qc5#
- 2.Qe5#
- 1...Bxb4
- 2.Qe3#
- 2.Qe5#
- 1...bxc4
- 2.Qc5#
- 2.Qe5#
- 1...Bc3
- 2.Qe3#
- 1...f1Q
- 2.Qe3#
- 2.Qc5#
- 2.Qe5#
- 1...f1S
- 2.Qf4#
- 2.Qc5#
- 2.Qe5#
- 1...f1R
- 2.Qe3#
- 2.Qc5#
- 2.Qe5#
- 1...Rd3
- 2.Qf4#
- 2.Qc5#
- 2.Qe5#
- 1...Rc6
- 2.Qe3#
- 2.Qf4#
- 2.Qe5#
- 1...Re6
- 2.Sf5#
- 2.Qc5#
- 1...Rf6
- 2.Qe3#
- 2.Qc5#
- 2.Qe5#
- 1...Bd2
- 2.Qc5#
- 2.Qe5#
- 1...Bf5
- 2.Sxf5#
- 2.Qe3#
- 1...Sd5
- 2.Qxd5#
- 2.Qe5#
- 1...Sa6
- 2.Qe3#
- 2.Qf4#
- 2.Qd5#
- 2.Qe5#
- 1...Se6
- 2.Sf5#
- 2.Qe3#
- 2.Qd5#
- 2.Qe5#
- 1...e5
- 2.Qe3#
- 2.Qxe5#
- 1...hxg5!
- threat
- 1.Qg7+?
- 1...e5
- 2.Qxe5#
- 1...Rf6!
- 1...e5
- 1.Qd8+?
- 1...Bd7
- 2.Sf5#
- 1...Sd5
- 2.Qxd5#
- 1...Rd6!
- 1...Bd7
- 1.cxb5?
- threat
- 2.Qc4#
- 1...Re6
- 2.Sf5#
- 1...Be6
- 2.Qg7#
- 1...Sd5
- 2.Qxd5#
- 1...Se6
- 2.Sf5#
- 1...e6
- 2.Qxg4#
- 1...Rc6!
- threat
- 1.Sb3+?
- Keys
- 1.Ree3!
- threat
- 2.Sb3#
- 1...Rxc1
- 2.Rad3#
- 1...bxc4
- 2.Qxc4#
- 1...Rd2
- 2.Bb2#
- 1...Rd3
- 2.Raxd3#
- 1...Re6
- 2.Sf5#
- 1...Bd2
- 2.Rad3#
- 1...Be6
- 2.Qg7#
- 1...Sd5
- 2.Qxd5#
- 1...Se6
- 2.Sf5#
- 1...e6
- 2.Qxg4#
- threat
- 1.Ree3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 4
- Sets
- R(a);S_CUTB(b)::B(A)
- R(h);S_CUTB(m)::S(H)
- B(m);N_GUARD::S(H),XB(m)
- B(m);S_CUTP(l),S_CUTR(h)::QAB(J)
- S(k);N_GUARD::QAR1(J),XS(k)
- S(k);N_GUARD::QAR1(J)
- S(k);S_CUTB(m)::S(H)
- P(g);OGATE,XP(G)::QAR1(J),XP(g)
- P(l);S_CUTB(m)::QAR(J),XP(f)
- Tries
- Try
- S(I);CHECK
- Vars
- K(e);P-FLIGHT::R1(C)
- Refutation
- K(e);S_FLIGHT
- Try
- B(A);CHECK
- Refutation
- K(e);S_FLIGHT
- Try
- R(D);
- Threat
- S(I)
- Vars
- P(g);OGATE,XP(G)::QAR1(J),XP(g)
- R(h);S_CUTB(m)::S(H)
- B(m);S_CUTP(l),S_CUTR(h)::QAB(J)
- S(k);N_GUARD::QAR1(J),XS(k)
- S(k);S_CUTB(m)::S(H)
- P(l);S_CUTB(m)::QAR(J),XP(f)
- Refutation
- R(a);
- Try
- Q(J);
- Threat
- DUALS(7)
- Vars
- R(h);XQ(J)::S(H)
- S(k);XQ(J)::S(H)
- Refutation
- B(m);XQ(J)
- Try
- Q(J);
- Threat
- DUALS(4)
- Vars
- B(b);::QAB1(J)
- Refutation
- P(i);XQ(J)
- Try
- Q(J);CHECK
- Vars
- P(l);P_SPINP(l)::QAB1(J),XP(l)
- Refutation
- R(h);P_SPINR(h)
- Try
- Q(J);CHECK
- Vars
- B(m);P_SPINB(m)::S(H)
- S(k);N_GUARD,P_SPINS(k)::QAR1(J),XS(k)
- Refutation
- R(h);P_SPINR(h)
- Try
- P(G);XP(g)
- Threat
- QAR1(J)
- Vars
- R(h);S_CUTB(m)::S(H)
- B(m);S_CUTP(l),S_CUTR(h)::QAB(J)
- S(k);N_GUARD::QAR1(J),XS(k)
- S(k);S_CUTB(m)::S(H)
- P(l);S_CUTB(m)::QAR(J),XP(f)
- Refutation
- R(h);
- Try
- Actual
- R(C);
- Threat
- S(I)
- Vars
- R(a);N_GUARD,XB(A)::R1(D)
- P(g);OGATE,XP(G)::QAR1(J),XP(g)
- R(a);S_CUTB(b)::B(A)
- R(a);N_GUARD::R1(D),XR(a)
- R(h);S_CUTB(m)::S(H)
- B(b);S_CUTR(a)::R1(D)
- B(m);S_CUTP(l),S_CUTR(h)::QAB(J)
- S(k);N_GUARD::QAR1(J),XS(k)
- S(k);S_CUTB(m)::S(H)
- P(l);S_CUTB(m)::QAR(J),XP(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).