MESON Chess Problem Database
Problem Display
PID: 30139 (1b2N1q1/5Rp1/2n5/1p2kB1p/rPP1N2R/4B1K1/8/1n2Q3 w - - 0 1)
Alvey, George Clarence Vincent
The Observer, 1922
(First published on Sun Mar 12 1922)
#2
10 + 9
| 3360 | Simple Two-move Themes | 1924 |
| 15148 | Sadier Collection | 2015 |
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Sd4
- 2.Bf4#
- 1...Sd4
- Tries
- 1.Sc3?
- threat
- 2.Bc1#
- 2.Bg1#
- 2.Bd2#
- 2.Bf2#
- 2.Bd4#
- 2.Bc5#
- 2.Bg5#
- 2.Bb6#
- 2.Bh6#
- 2.Ba7#
- 2.Re4#
- 1...Qxe8
- 2.Bc5#
- 1...Sxc3
- 2.Bd4#
- 1...Ra2
- 2.Bd2#
- 2.Bd4#
- 2.Re4#
- 1...Ra7
- 2.Bc1#
- 2.Bg1#
- 2.Bd2#
- 2.Bf2#
- 2.Bd4#
- 2.Bc5#
- 2.Bg5#
- 2.Bb6#
- 2.Bh6#
- 2.Bxa7#
- 2.Re4#
- 1...Ba7
- 2.Bd4#
- 2.Bc5#
- 2.Bb6#
- 2.Bxa7#
- 2.Re4#
- 1...Sd2
- 2.Bxd2#
- 2.Bd4#
- 1...Sd4
- 2.Bxd4#
- 2.Bf4#
- 2.Re4#
- 1...Sa7
- 2.Bc1#
- 2.Bg1#
- 2.Bd2#
- 2.Bf2#
- 2.Bd4#
- 2.Bc5#
- 2.Bg5#
- 2.Bb6#
- 2.Bh6#
- 2.Bxa7#
- 2.Re4#
- 1...g5
- 2.Bc1#
- 2.Bg1#
- 2.Bd2#
- 2.Bf2#
- 2.Bd4#
- 2.Bc5#
- 2.Bxg5#
- 2.Bb6#
- 2.Ba7#
- 2.Re4#
- 1...Qxf7!
- threat
- 1.S4d6?
- threat
- 2.Bc1#
- 2.Bg1#
- 2.Bd2#
- 2.Bf2#
- 2.Bd4#
- 2.Bc5#
- 2.Bg5#
- 2.Bb6#
- 2.Bh6#
- 2.Ba7#
- 2.Re4#
- 1...Qxe8
- 2.Bc5#
- 1...Ra2
- 2.Bd2#
- 2.Bd4#
- 2.Re4#
- 1...Ra3
- 2.Re4#
- 1...Ra7
- 2.Bc1#
- 2.Bg1#
- 2.Bd2#
- 2.Bf2#
- 2.Bd4#
- 2.Bc5#
- 2.Bg5#
- 2.Bb6#
- 2.Bh6#
- 2.Bxa7#
- 2.Re4#
- 1...Ba7
- 2.Bd4#
- 2.Bc5#
- 2.Bb6#
- 2.Bxa7#
- 2.Re4#
- 1...Sd2
- 2.Bxd2#
- 2.Bd4#
- 1...Sc3
- 2.Bd4#
- 1...Sd4
- 2.Bxd4#
- 2.Bf4#
- 2.Re4#
- 1...Sa7
- 2.Bc1#
- 2.Bg1#
- 2.Bd2#
- 2.Bf2#
- 2.Bd4#
- 2.Bc5#
- 2.Bg5#
- 2.Bb6#
- 2.Bh6#
- 2.Bxa7#
- 2.Re4#
- 1...g5
- 2.Bc1#
- 2.Bg1#
- 2.Bd2#
- 2.Bf2#
- 2.Bd4#
- 2.Bc5#
- 2.Bxg5#
- 2.Bb6#
- 2.Ba7#
- 2.Re4#
- 1...bxc4!
- threat
- 1.Bc1?
- threat
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sg5#
- 2.S4d6#
- 1...Kd4+
- 2.S4d6#
- 1...Ra3+
- 2.Sc3#
- 1...Qxf7
- 2.S4d6#
- 1...bxc4
- 2.Sc3#
- 1...Ra2
- 2.Sd2#
- 1...Bd6
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sg5#
- 2.S4xd6#
- 1...Ba7
- 2.Sc5#
- 1...Sd2
- 2.Sxd2#
- 1...Sc3
- 2.Sxc3#
- 1...Sd4
- 2.Bf4#
- 1...g5
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sxg5#
- 2.S4d6#
- 1...Qxe8!
- threat
- 1.Bd2?
- threat
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sg5#
- 2.S4d6#
- 1...Kd4+
- 2.S4d6#
- 1...Ra3+
- 2.Sc3#
- 1...Qxf7
- 2.S4d6#
- 1...Sxd2
- 2.Sxd2#
- 1...bxc4
- 2.Sc3#
- 1...Bd6
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sg5#
- 2.S4xd6#
- 1...Ba7
- 2.Sc5#
- 1...Sc3
- 2.Sxc3#
- 1...Sd4
- 2.Bf4#
- 1...g5
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sxg5#
- 2.S4d6#
- 1...Qxe8!
- threat
- 1.Bd4+?
- 1...Kxd4+
- 2.S4d6#
- 1...Sxd4!
- 1...Kxd4+
- 1.Bc5?
- threat
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sg5#
- 2.S4d6#
- 1...Ra3+
- 2.Sc3#
- 1...Qxf7
- 2.S4d6#
- 1...bxc4
- 2.Sc3#
- 1...Ra2
- 2.Sd2#
- 1...Bd6
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sg5#
- 2.S4xd6#
- 1...Sd2
- 2.Sxd2#
- 1...Sc3
- 2.Sxc3#
- 1...g5
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sxg5#
- 2.S4d6#
- 1...Sd4!
- threat
- 1.Bg5?
- threat
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.S4d6#
- 1...Kd4+
- 2.S4d6#
- 1...Ra3+
- 2.Sc3#
- 1...Qxf7
- 2.S4d6#
- 1...bxc4
- 2.Sc3#
- 1...Sd4
- 2.Bf4#
- 1...Ra2
- 2.Sd2#
- 1...Bd6
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.S4xd6#
- 1...Ba7
- 2.Sc5#
- 1...Sd2
- 2.Sxd2#
- 1...Sc3
- 2.Sxc3#
- 1...Qxe8!
- threat
- 1.Ba7?
- threat
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sg5#
- 2.S4d6#
- 1...Ra3+
- 2.Sc3#
- 1...Qxf7
- 2.S4d6#
- 1...Bxa7
- 2.Sc5#
- 1...bxc4
- 2.Sc3#
- 1...Sd4
- 2.Bxb8#
- 1...Ra2
- 2.Sd2#
- 1...Bd6
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sg5#
- 2.S4xd6#
- 1...Sd2
- 2.Sxd2#
- 1...Sc3
- 2.Sxc3#
- 1...g5
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sxg5#
- 2.S4d6#
- 1...Qxe8!
- threat
- 1.Qc3+?
- 1...Sd4
- 2.Bxd4#
- 2.Bf4#
- 2.Qxd4#
- 1...Sxc3!
- 1...Sd4
- 1.Sc3?
- Keys
- 1.Bh6!
- threat
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sg5#
- 2.S4d6#
- 1...Kd4+
- 2.S4d6#
- 1...Ra3+
- 2.Sc3#
- 1...gxh6+
- 2.Sg5#
- 1...Qxf7
- 2.S4d6#
- 1...Qxe8
- 2.Bxg7#
- 1...bxc4
- 2.Sc3#
- 1...Sd4
- 2.Bf4#
- 1...Ra2
- 2.Sd2#
- 1...Bd6
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sg5#
- 2.S4xd6#
- 1...Ba7
- 2.Sc5#
- 1...Sd2
- 2.Sxd2#
- 1...Sc3
- 2.Sxc3#
- 1...g5
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sc5#
- 2.Sxg5#
- 2.S4d6#
- threat
- 1.Bh6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 10
- REMOVED MATES = 0
- Sets
- S(f);SBLOCK::B(B)
- Tries
- Try
- S(F);
- Threat
- DUALS(11)
- Vars
- Q(i);XS(J)::QAR(A)+B(B)
- S(a);XS(F)::QAR(A)+B(B),DCHECK
- Refutation
- Q(i);XR(I)
- Try
- S(F);
- Threat
- DUALS(11)
- Vars
- Q(i);XS(J)::QAR(A)+B(B)
- R(b);P_PINB(B)::R1(G)
- S(a);::QAR(A)+B(B),DCHECK
- Refutation
- P(c);XP(E)
- Try
- B(B);
- Threat
- DUALS(6)
- Vars
- K(d);CHECK,S_FLIGHT::R(G)+S(F)
- R(b);CHECK::QAR(A)+S(F)
- Q(i);XR(I)::QAR(A)+S(F)
- P(c);XP(E)::QAR(A)+S(F)
- R(b);::QAR(A)+S(F)
- B(h);::QAR(A)+S(F)
- S(a);::QAR(A)+S(F),XS(a)
- S(f);SBLOCK::B(B)
- Refutation
- Q(i);XS(J)
- Try
- B(B);
- Threat
- DUALS(5)
- Vars
- K(d);CHECK,S_FLIGHT::R(G)+S(F)
- R(b);CHECK::QAR(A)+S(F)
- Q(i);XR(I)::QAR(A)+S(F)
- S(a);XB(B)::QAR(A)+S(F),XS(a)
- P(c);XP(E)::QAR(A)+S(F)
- B(h);::QAR(A)+S(F)
- S(a);::QAR(A)+S(F),XS(a)
- S(f);SBLOCK::B(B)
- Refutation
- Q(i);XS(J)
- Try
- B(B);CHECK
- Vars
- K(d);CHECK,S_FLIGHT,XB(B)::R(G)+S(F)
- Refutation
- S(f);XB(B)
- Try
- B(B);
- Threat
- DUALS(5)
- Vars
- R(b);CHECK::QAR(A)+S(F)
- Q(i);XR(I)::QAR(A)+S(F)
- P(c);XP(E)::QAR(A)+S(F)
- R(b);::QAR(A)+S(F)
- S(a);::QAR(A)+S(F),XS(a)
- Refutation
- S(f);
- Try
- B(B);
- Threat
- DUALS(5)
- Vars
- K(d);CHECK,S_FLIGHT::R(G)+S(F)
- R(b);CHECK::QAR(A)+S(F)
- Q(i);XR(I)::QAR(A)+S(F)
- P(c);XP(E)::QAR(A)+S(F)
- S(f);SBLOCK::B(B)
- R(b);::QAR(A)+S(F)
- B(h);::QAR(A)+S(F)
- S(a);::QAR(A)+S(F),XS(a)
- Refutation
- Q(i);XS(J)
- Try
- B(B);
- Threat
- DUALS(6)
- Vars
- R(b);CHECK::QAR(A)+S(F)
- Q(i);XR(I)::QAR(A)+S(F)
- B(h);XB(B)::QAR(A)+S(F)
- P(c);XP(E)::QAR(A)+S(F)
- S(f);N_GUARD,SBLOCK::B(B),XB(h)
- R(b);::QAR(A)+S(F)
- S(a);::QAR(A)+S(F),XS(a)
- Refutation
- Q(i);XS(J)
- Try
- Q(A);CHECK
- Refutation
- S(a);XQ(A)
- Try
- Actual
- B(B);
- Threat
- DUALS(6)
- Vars
- K(d);CHECK,S_FLIGHT::R(G)+S(F)
- R(b);CHECK::QAR(A)+S(F)
- P(g);CHECK,XB(B)::QAR(A)+S(F)
- Q(i);XR(I)::QAR(A)+S(F)
- Q(i);N_GUARD,XS(J)::B(B),XP(g)
- P(c);XP(E)::QAR(A)+S(F)
- S(f);SBLOCK::B(B)
- R(b);::QAR(A)+S(F)
- B(h);::QAR(A)+S(F)
- S(a);::QAR(A)+S(F),XS(a)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
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