MESON Chess Problem Database
Problem Display
PID: 164564 (6q1/3Q4/3PNP2/1rp2kNB/pP6/4P3/KB3n2/6Rn w - - 0 1)
Ellerman, Arnoldo
The Observer, 1926
(First published on Sun Aug 8 1926)
#2
11 + 7
| 15239 | Valois Notebooks | 2017 |
SOLUTION
- SOUND
- Sets
- 1...Qxe6+
- 2.Qxe6#
- 1...Qh7
- 2.Sg7#
- 2.Qxh7#
- 1...Qxg5
- 2.Sxc5#
- 2.Sxg5#
- 1...Qg6
- 2.Sf4#
- 2.Sxc5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sf8#
- 1...Qg7
- 2.Sxg7#
- 1...Qa8
- 2.Sf4#
- 2.Sxc5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sf8#
- 2.Qh7#
- 1...Qb8
- 2.Sf4#
- 2.Sxc5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sf8#
- 2.Qh7#
- 1...Qc8
- 2.Sg7#
- 2.Qh7#
- 1...Qd8
- 2.Sg7#
- 2.Sxd8#
- 2.Qh7#
- 1...Qe8
- 2.Sg7#
- 1...Qf8
- 2.Sf4#
- 2.Sxc5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sxf8#
- 2.Qh7#
- 1...Qh8
- 2.Sf4#
- 2.Sxc5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sf8#
- 1...Sd1
- 2.e4#
- 1...Sd3
- 2.e4#
- 1...Sh3
- 2.e4#
- 1...Sg4
- 2.e4#
- 1...cxb4
- 2.Qxb5#
- 1...c4
- 2.Sg7#
- 2.Qxb5#
- 1...Qxe6+
- Tries
- 1.Ka1?
- threat
- 2.Sg7#
- 1...Qxe6
- 2.Qxe6#
- 2.Qh7#
- 1...Qxg5
- 2.Sxc5#
- 2.Sxg5#
- 1...Qg7
- 2.Sxg7#
- 1...Sg4
- 2.e4#
- 1...Sg3!
- threat
- 1.Kb1?
- threat
- 2.Sg7#
- 1...Qxe6
- 2.Qxe6#
- 2.Qh7#
- 1...Qxg5
- 2.Sxc5#
- 2.Sxg5#
- 1...Qg7
- 2.Sxg7#
- 1...Sg4
- 2.e4#
- 1...Sg3!
- threat
- 1.Bg6+?
- 1...Qxg6
- 2.Sf4#
- 2.Sxc5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sf8#
- 1...Kxg6!
- 1...Qxg6
- 1.Rg4?
- threat
- 2.Rf4#
- 1...Qxe6+
- 2.Qxe6#
- 1...Qxg5
- 2.Sxc5#
- 2.Sxg5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sf8#
- 1...Sxg4
- 2.e4#
- 1...Sd3
- 2.e4#
- 1...Sh3
- 2.e4#
- 1...Rxb4!
- threat
- 1.Qc6?
- threat
- 2.Qf3#
- 2.Qd5#
- 1...Qxg5
- 2.Qd5#
- 1...Rxb4
- 2.Qd5#
- 2.Qxc5#
- 1...cxb4
- 2.Qf3#
- 2.Qxb5#
- 1...Qa8
- 2.Sg7#
- 1...Sd3
- 2.Qe4#
- 2.e4#
- 1...Sh3
- 2.Qe4#
- 2.Qd5#
- 2.e4#
- 1...Se4
- 2.Qxe4#
- 2.Qd5#
- 1...Sg4
- 2.Qf3#
- 2.Qe4#
- 2.e4#
- 1...c4
- 2.Qf3#
- 2.Qxb5#
- 1...Qxe6+!
- threat
- 1.Qh7+?
- 1...Qg6
- 2.Sg7#
- 2.Bxg6#
- 2.Qxg6#
- 1...Qxh7!
- 1...Qg6
- 1.f7?
- threat
- 2.Sf4#
- 2.Sxc5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sf8#
- 1...Qxf7
- 2.Qxf7#
- 1...Qxg5
- 2.Sxc5#
- 2.Sxg5#
- 1...cxb4
- 2.Sf4#
- 2.Sc5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sf8#
- 2.Qxb5#
- 1...Qg6
- 2.Sg7#
- 1...Qg7
- 2.Sf4#
- 2.Sxc5#
- 2.Sc7#
- 2.Sxg7#
- 2.Sd8#
- 2.Sf8#
- 1...Qc8
- 2.Sg7#
- 1...Qd8
- 2.Sg7#
- 2.Sxd8#
- 1...Qe8
- 2.Sg7#
- 1...Qf8
- 2.Sf4#
- 2.Sxc5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sxf8#
- 1...Rb7
- 2.Sc7#
- 2.Sg7#
- 1...Sg4
- 2.e4#
- 1...c4
- 2.Sf4#
- 2.Sc5#
- 2.Sc7#
- 2.Sg7#
- 2.Sd8#
- 2.Sf8#
- 2.Qxb5#
- 1...Sg3!
- threat
- 1.Ka1?
- Keys
- 1.Rd1!
- threat
- 2.Rd5#
- 1...Qxg5
- 2.Sxc5#
- 1...Sxd1
- 2.e4#
- 1...cxb4
- 2.Qxb5#
- 1...Qa8
- 2.Qh7#
- 1...Sd3
- 2.e4#
- 1...Sg4
- 2.e4#
- 1...c4
- 2.Qxb5#
- threat
- 1.Rd1!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 4
- Sets
- Q(g);CHECK,OGATE,P_SPINQ(g),XS(I)::QAB1(K),XQ(g)
- Q(g);N_PINS(I)::QAB(K)+S(I),DCHECK,XQ(g)
- Q(g);N_PINS(I)::QAB(K)+S(I),DCHECK
- S(b);N_GUARD::P(D)
- P(e);OGATEB,XP(E)::QAR(K),XR(d)
- Tries
- Try
- K(B);N_SPINS(I),P-FLIGHT
- Threat
- QAB(K)+S(I),DCHECK
- Vars
- Q(g);::QAB(K)+S(I),DCHECK,XQ(g)
- S(b);N_GUARD::P(D)
- Refutation
- S(a);
- Try
- K(B);N_SPINS(I),S_FLIGHT
- Threat
- QAB(K)+S(I),DCHECK
- Vars
- Q(g);::QAB(K)+S(I),DCHECK,XQ(g)
- S(b);N_GUARD::P(D)
- Refutation
- S(a);
- Try
- B(G);CHECK
- Refutation
- K(f);S_FLIGHT,XB(G)
- Try
- R(A);
- Threat
- R1(A)
- Vars
- Q(g);CHECK,OGATE,P_SPINQ(g),XS(I)::QAB1(K),XQ(g)
- S(b);N_GUARD,XR(A)::P(D)
- S(b);N_GUARD::P(D)
- Refutation
- R(d);XP(E)
- Try
- Q(K);
- Threat
- DUALS(2)
- Vars
- Q(g);N_PINS(I),XS(F)::QAR2(K)
- Q(g);N_PINS(I)::S(I)
- Refutation
- Q(g);CHECK,XS(I)
- Try
- Q(K);CHECK
- Refutation
- Q(g);N_PINS(I),XQ(K)
- Try
- P(J);N_SPINS(I)
- Threat
- DUALS(6)
- Vars
- Q(g);OGATE,P_PINS(I),XP(J)::QAR2(K),XQ(g)
- Q(g);::QAB(K)+S(I),DCHECK
- S(b);N_GUARD::P(D)
- Refutation
- S(a);
- Try
- Actual
- R(A);
- Threat
- R(A)
- Vars
- Q(g);N_PINS(I),SBLOCK,XS(F)::QAB(K)+S(I),XP(e)
- S(b);N_GUARD,XR(A)::P(D)
- P(e);OGATEB,XP(E)::QAR(K),XR(d)
- Q(g);N_GUARD,N_PINS(I)::QAB(K)
- S(b);N_GUARD::P(D)
- P(e);N_PINS(I),OGATEB::QAR(K),XR(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).