MESON Chess Problem Database
Problem Display
PID: 140568 (8/BQ3n2/5n2/4p3/2N3p1/3k2P1/Pp6/1NbK4 w - - 0 1)
Stewart, John
The Observer, 1921
(First published on Sun Aug 14 1921)
#2
7 + 7
| 56 | The Problemist | 1943 |
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Kxc4
- 2.Qb3#
- 1...Bd2
- 2.Sxb2#
- 1...Be3
- 2.Sxb2#
- 1...Bf4
- 2.Sxb2#
- 1...Bg5
- 2.Sxb2#
- 1...Bh6
- 2.Sxb2#
- 1...Se4
- 2.Qd5#
- 1...Sd5
- 2.Qxd5#
- 1...Sh5
- 2.Qd5#
- 1...Sd7
- 2.Qd5#
- 1...Sh7
- 2.Qd5#
- 1...Se8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Sg5
- 2.Sxe5#
- 1...Sd6
- 2.Sxe5#
- 1...Sh6
- 2.Sxe5#
- 1...Sd8
- 2.Sxe5#
- 1...Sh8
- 2.Sxe5#
- 1...e4
- 2.Qb3#
- 1...Kxc4
- Tries
- 1.Scd2?
- threat
- 2.Qa6#
- 2.Qb3#
- 2.Qb5#
- 1...Se4
- 2.Qxe4#
- 2.Qd5#
- 2.Qa6#
- 2.Qb5#
- 1...Sd5
- 2.Qxd5#
- 2.Qa6#
- 2.Qb5#
- 1...Sd6
- 2.Qb3#
- 1...Bxd2!
- threat
- 1.Sd6?
- threat
- 2.Qa6#
- 2.Qb3#
- 2.Qb5#
- 1...Bd2
- 2.Qa6#
- 2.Qb5#
- 1...Se4
- 2.Qxe4#
- 2.Qd5#
- 2.Qa6#
- 2.Qb5#
- 1...Sd5
- 2.Qxd5#
- 2.Qa6#
- 2.Qb5#
- 1...Sxd6!
- threat
- 1.Bg1?
- 1...Kxc4
- 2.Qb3#
- 1...Sd5
- 2.Qxd5#
- 1...Bd2
- 2.Sxb2#
- 1...Bf4
- 2.Sxb2#
- 1...Bg5
- 2.Sxb2#
- 1...Bh6
- 2.Sxb2#
- 1...Se4
- 2.Qd5#
- 1...Sh5
- 2.Qd5#
- 1...Sd7
- 2.Qd5#
- 1...Sh7
- 2.Qd5#
- 1...Se8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Sg5
- 2.Sxe5#
- 1...Sd6
- 2.Sxe5#
- 1...Sh6
- 2.Sxe5#
- 1...Sd8
- 2.Sxe5#
- 1...Sh8
- 2.Sxe5#
- 1...e4
- 2.Qb3#
- 1...Be3!
- 1...Kxc4
- 1.Bf2?
- 1...Kxc4
- 2.Qb3#
- 1...Sd5
- 2.Qxd5#
- 1...Bd2
- 2.Sxb2#
- 1...Bf4
- 2.Sxb2#
- 1...Bg5
- 2.Sxb2#
- 1...Bh6
- 2.Sxb2#
- 1...Se4
- 2.Qd5#
- 1...Sh5
- 2.Qd5#
- 1...Sd7
- 2.Qd5#
- 1...Sh7
- 2.Qd5#
- 1...Se8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Sg5
- 2.Sxe5#
- 1...Sd6
- 2.Sxe5#
- 1...Sh6
- 2.Sxe5#
- 1...Sd8
- 2.Sxe5#
- 1...Sh8
- 2.Sxe5#
- 1...e4
- 2.Qb3#
- 1...Be3!
- 1...Kxc4
- 1.Bc5?
- 1...Sd5
- 2.Qxd5#
- 1...Bd2
- 2.Sxb2#
- 1...Be3
- 2.Sxb2#
- 1...Bf4
- 2.Sxb2#
- 1...Bg5
- 2.Sxb2#
- 1...Bh6
- 2.Sxb2#
- 1...Se4
- 2.Qd5#
- 1...Sh5
- 2.Qd5#
- 1...Sd7
- 2.Qd5#
- 1...Sh7
- 2.Qd5#
- 1...Se8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Sg5
- 2.Sxe5#
- 1...Sd6
- 2.Sxe5#
- 1...Sh6
- 2.Sxe5#
- 1...Sd8
- 2.Sxe5#
- 1...Sh8
- 2.Sxe5#
- 1...e4
- 2.Qb3#
- 1...Kxc4!
- 1...Sd5
- 1.Qh1?
- 1...Bd2
- 2.Sxb2#
- 1...Be3
- 2.Sxb2#
- 1...Bf4
- 2.Sxb2#
- 1...Bg5
- 2.Sxb2#
- 1...Bh6
- 2.Sxb2#
- 1...Se4
- 2.Qf1#
- 1...Sd5
- 2.Qxd5#
- 1...Sh5
- 2.Qd5#
- 1...Sd7
- 2.Qd5#
- 1...Sh7
- 2.Qd5#
- 1...Se8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Sg5
- 2.Sxe5#
- 1...Sd6
- 2.Sxe5#
- 1...Sh6
- 2.Sxe5#
- 1...Sd8
- 2.Sxe5#
- 1...Sh8
- 2.Sxe5#
- 1...e4
- 2.Qf1#
- 1...Kxc4!
- 1...Bd2
- 1.Qg2?
- threat
- 2.Qc2#
- 2.Qe2#
- 1...Bd2
- 2.Sxb2#
- 2.Qe2#
- 1...Be3
- 2.Sxb2#
- 2.Qc2#
- 1...Kxc4!
- threat
- 1.Qf3+?
- 1...Kxc4
- 2.Qb3#
- 1...Be3
- 2.Sxb2#
- 1...gxf3!
- 1...Kxc4
- 1.Qa6?
- threat
- 2.Scd2#
- 2.Sd6#
- 1...Bd2
- 2.Scxd2#
- 2.Sd6#
- 1...Sd6
- 2.Sxd6#
- 1...Ke4!
- threat
- 1.Qc6?
- 1...Sd5
- 2.Qxd5#
- 1...Bd2
- 2.Sxb2#
- 1...Be3
- 2.Sxb2#
- 1...Bf4
- 2.Sxb2#
- 1...Bg5
- 2.Sxb2#
- 1...Bh6
- 2.Sxb2#
- 1...Se4
- 2.Qd5#
- 1...Sh5
- 2.Qd5#
- 1...Sd7
- 2.Qd5#
- 1...Sh7
- 2.Qd5#
- 1...Se8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Sg5
- 2.Sxe5#
- 1...Sd6
- 2.Sxe5#
- 1...Sh6
- 2.Sxe5#
- 1...Sd8
- 2.Sxe5#
- 1...Sh8
- 2.Sxe5#
- 1...e4!
- 1...Sd5
- 1.Qb5?
- threat
- 2.Scd2#
- 2.Sd6#
- 1...Bd2
- 2.Scxd2#
- 2.Sd6#
- 1...Sd6
- 2.Sxd6#
- 1...Ke4!
- threat
- 1.a3?
- 1...Sd5
- 2.Qxd5#
- 1...Bd2
- 2.Sxb2#
- 1...Be3
- 2.Sxb2#
- 1...Bf4
- 2.Sxb2#
- 1...Bg5
- 2.Sxb2#
- 1...Bh6
- 2.Sxb2#
- 1...Se4
- 2.Qd5#
- 1...Sh5
- 2.Qd5#
- 1...Sd7
- 2.Qd5#
- 1...Sh7
- 2.Qd5#
- 1...Se8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Sg5
- 2.Sxe5#
- 1...Sd6
- 2.Sxe5#
- 1...Sh6
- 2.Sxe5#
- 1...Sd8
- 2.Sxe5#
- 1...Sh8
- 2.Sxe5#
- 1...e4
- 2.Qb3#
- 1...Kxc4!
- 1...Sd5
- 1.Scd2?
- Keys
- 1.a4!
- 1...Kxc4
- 2.Qb5#
- 1...Sd5
- 2.Qxd5#
- 1...Bd2
- 2.Sxb2#
- 1...Be3
- 2.Sxb2#
- 1...Bf4
- 2.Sxb2#
- 1...Bg5
- 2.Sxb2#
- 1...Bh6
- 2.Sxb2#
- 1...Se4
- 2.Qd5#
- 1...Sh5
- 2.Qd5#
- 1...Sd7
- 2.Qd5#
- 1...Sh7
- 2.Qd5#
- 1...Se8
- 2.Qd5#
- 1...Sg8
- 2.Qd5#
- 1...Sg5
- 2.Sxe5#
- 1...Sd6
- 2.Sxe5#
- 1...Sh6
- 2.Sxe5#
- 1...Sd8
- 2.Sxe5#
- 1...Sh8
- 2.Sxe5#
- 1...e4
- 2.Qb3#
- 1...Kxc4
- 1.a4!
This is a version of 63675
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- K(c);S_FLIGHT,XS(E)::QAB1(G)
- B(a);N_GUARD::S(E),XP(b)
- S(f);N_GUARD::QAR2(G)
- S(f);N_GUARD::QAR2(G),XS(f)
- S(g);N_GUARD::S(E),XP(e)
- P(e);SBLOCK::QAR2(G)
- Tries
- Try
- S(E);
- Threat
- DUALS(3)
- Vars
- S(g);::QAR2(G)
- Refutation
- B(a);XS(E)
- Try
- S(E);
- Threat
- DUALS(3)
- Refutation
- S(g);XS(E)
- Try
- B(F);
- Vars
- K(c);S_FLIGHT,XS(E)::QAB1(G)
- S(f);N_GUARD::QAR2(G),XS(f)
- B(a);N_GUARD::S(E),XP(b)
- S(f);N_GUARD::QAR2(G)
- S(g);N_GUARD::S(E),XP(e)
- P(e);SBLOCK::QAR2(G)
- Refutation
- B(a);
- Try
- B(F);
- Vars
- K(c);S_FLIGHT,XS(E)::QAB1(G)
- S(f);N_GUARD::QAR2(G),XS(f)
- B(a);N_GUARD::S(E),XP(b)
- S(f);N_GUARD::QAR2(G)
- S(g);N_GUARD::S(E),XP(e)
- P(e);SBLOCK::QAR2(G)
- Refutation
- B(a);
- Try
- B(F);
- Vars
- S(f);N_GUARD::QAR2(G),XS(f)
- B(a);N_GUARD::S(E),XP(b)
- S(f);N_GUARD::QAR2(G)
- S(g);N_GUARD::S(E),XP(e)
- P(e);SBLOCK::QAR2(G)
- Refutation
- K(c);S_FLIGHT,XS(E)
- Try
- Q(G);
- Vars
- B(a);N_GUARD::S(E),XP(b)
- S(f);SBLOCK::QAB(G)
- S(f);N_GUARD::QAR2(G),XS(f)
- S(f);N_GUARD::QAR2(G)
- S(g);N_GUARD::S(E),XP(e)
- P(e);SBLOCK::QAB(G)
- Refutation
- K(c);S_FLIGHT,XS(E)
- Try
- Q(G);
- Threat
- DUALS(2)
- Refutation
- K(c);S_FLIGHT,XS(E)
- Try
- Q(G);CHECK
- Vars
- K(c);OGATE,S_FLIGHT,XS(E)::QAB1(G)
- B(a);P_SPINB(a)::S(E),XP(b)
- Refutation
- P(d);XQ(G)
- Try
- Q(G);
- Threat
- DUALS(2)
- Vars
- S(g);::QAB(G)+S(E),XS(g)
- Refutation
- K(c);S_FLIGHT
- Try
- Q(G);
- Vars
- S(f);N_GUARD::QAR2(G),XS(f)
- B(a);N_GUARD::S(E),XP(b)
- S(f);N_GUARD::QAR2(G)
- S(g);N_GUARD::S(E),XP(e)
- Refutation
- P(e);
- Try
- Q(G);
- Threat
- DUALS(2)
- Vars
- S(g);::QAB(G)+S(E),XS(g)
- Refutation
- K(c);S_FLIGHT
- Try
- P(C);
- Vars
- S(f);N_GUARD::QAR2(G),XS(f)
- B(a);N_GUARD::S(E),XP(b)
- S(f);N_GUARD::QAR2(G)
- S(g);N_GUARD::S(E),XP(e)
- P(e);SBLOCK::QAR2(G)
- Refutation
- K(c);S_FLIGHT,XS(E)
- Try
- Actual
- P(C);
- Vars
- K(c);OGATEB,S_FLIGHT,XS(E)::QAB1(G)
- S(f);N_GUARD::QAR2(G),XS(f)
- B(a);N_GUARD::S(E),XP(b)
- S(f);N_GUARD::QAR2(G)
- S(g);N_GUARD::S(E),XP(e)
- P(e);SBLOCK::QAR2(G)
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).