MESON Chess Problem Database
Problem Display
PID: 196442 (4B3/8/3Pk1r1/4B1nR/5Qp1/2N1n1P1/5R2/7K w - - 0 1)
Simmons, DC
The Observer, 1943
(First published on Sun Jun 27 1943)
#2
9 + 5
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Rf6
- 2.Qxf6#
- 1...Rh6
- 2.Rxh6#
- 1...Rg7
- 2.Qf6#
- 1...Rg8
- 2.Qf6#
- 1...Sd1
- 2.Qf5#
- 1...Sf1
- 2.Qf5#
- 1...Sc2
- 2.Qf5#
- 1...Sg2
- 2.Qf5#
- 1...Sc4
- 2.Qf5#
- 1...Sd5
- 2.Qf5#
- 1...Sf5
- 2.Qxf5#
- 1...Sf3
- 2.Qf7#
- 1...Sh3
- 2.Qf7#
- 1...Se4
- 2.Qf7#
- 1...Sf7
- 2.Qxf7#
- 1...Sh7
- 2.Qf7#
- 1...Rf6
- Tries
- 1.Ba4?
- 1...Rf6
- 2.Qxf6#
- 1...Sf5
- 2.Qxf5#
- 1...Rh6
- 2.Rxh6#
- 1...Rg7
- 2.Qf6#
- 1...Rg8
- 2.Qf6#
- 1...Sd1
- 2.Qf5#
- 1...Sf1
- 2.Qf5#
- 1...Sc2
- 2.Qf5#
- 1...Sg2
- 2.Qf5#
- 1...Sc4
- 2.Qf5#
- 1...Sd5
- 2.Qf5#
- 1...Sh3
- 2.Qf7#
- 1...Se4
- 2.Qf7#
- 1...Sf7
- 2.Qxf7#
- 1...Sh7
- 2.Qf7#
- 1...Sf3!
- 1...Rf6
- 1.Bb5?
- 1...Rf6
- 2.Qxf6#
- 1...Sf5
- 2.Qxf5#
- 1...Rh6
- 2.Rxh6#
- 1...Rg7
- 2.Qf6#
- 1...Rg8
- 2.Qf6#
- 1...Sd1
- 2.Qf5#
- 1...Sf1
- 2.Qf5#
- 1...Sc2
- 2.Qf5#
- 1...Sg2
- 2.Qf5#
- 1...Sc4
- 2.Qf5#
- 1...Sd5
- 2.Qf5#
- 1...Sh3
- 2.Qf7#
- 1...Se4
- 2.Qf7#
- 1...Sf7
- 2.Qxf7#
- 1...Sh7
- 2.Qf7#
- 1...Sf3!
- 1...Rf6
- 1.Bc6?
- 1...Rf6
- 2.Qxf6#
- 1...Sf5
- 2.Qxf5#
- 1...Rh6
- 2.Rxh6#
- 1...Rg7
- 2.Qf6#
- 1...Rg8
- 2.Qf6#
- 1...Sd1
- 2.Qf5#
- 1...Sf1
- 2.Qf5#
- 1...Sc2
- 2.Qf5#
- 1...Sg2
- 2.Qf5#
- 1...Sc4
- 2.Qf5#
- 1...Sd5
- 2.Qf5#
- 1...Sh3
- 2.Qf7#
- 1...Se4
- 2.Qf7#
- 1...Sf7
- 2.Qxf7#
- 1...Sh7
- 2.Qf7#
- 1...Sf3!
- 1...Rf6
- 1.Bxg6?
- 1...Sf3
- 2.Qf7#
- 1...Sd1
- 2.Qf5#
- 1...Sf1
- 2.Qf5#
- 1...Sc2
- 2.Qf5#
- 1...Sg2
- 2.Qf5#
- 1...Sc4
- 2.Qf5#
- 1...Sd5
- 2.Qf5#
- 1...Sf5
- 2.Qxf5#
- 1...Sh3
- 2.Qf7#
- 1...Se4
- 2.Qf7#
- 1...Sf7
- 2.Qxf7#
- 1...Sh7
- 2.Qf7#
- 1...Kd7!
- 1...Sf3
- 1.Bf7+?
- 1...Sxf7
- 2.Qxf7#
- 1...Kd7!
- 1...Sxf7
- 1.Rf1?
- 1...Sf3
- 2.Qf7#
- 1...Rf6
- 2.Qxf6#
- 1...Rh6
- 2.Rxh6#
- 1...Rg7
- 2.Qf6#
- 1...Rg8
- 2.Qf6#
- 1...Sd1
- 2.Qf5#
- 1...Sc2
- 2.Qf5#
- 1...Sg2
- 2.Qf5#
- 1...Sc4
- 2.Qf5#
- 1...Sd5
- 2.Qf5#
- 1...Sf5
- 2.Qxf5#
- 1...Sh3
- 2.Qf7#
- 1...Se4
- 2.Qf7#
- 1...Sf7
- 2.Qxf7#
- 1...Sh7
- 2.Qf7#
- 1...Sxf1!
- 1...Sf3
- 1.Rf3?
- 1...Sxf3
- 2.Qf7#
- 1...Rf6
- 2.Qxf6#
- 1...Rh6
- 2.Rxh6#
- 1...Rg7
- 2.Qf6#
- 1...Rg8
- 2.Qf6#
- 1...Sd1
- 2.Qf5#
- 1...Sf1
- 2.Qf5#
- 1...Sc2
- 2.Qf5#
- 1...Sg2
- 2.Qf5#
- 1...Sc4
- 2.Qf5#
- 1...Sd5
- 2.Qf5#
- 1...Sf5
- 2.Qxf5#
- 1...Sh3
- 2.Qf7#
- 1...Se4
- 2.Qf7#
- 1...Sf7
- 2.Qxf7#
- 1...Sh7
- 2.Qf7#
- 1...gxf3!
- 1...Sxf3
- 1.Rxg5?
- threat
- 2.Rxg6#
- 2.Qf7#
- 1...Rxg5
- 2.Qf6#
- 1...Rf6
- 2.Qxf6#
- 1...Rg7
- 2.Qf6#
- 1...Rg8
- 2.Qf6#
- 2.Qf7#
- 1...Sd5
- 2.Qxg4#
- 2.Qf5#
- 2.Qf7#
- 1...Sf5
- 2.Rxg6#
- 2.Qxf5#
- 1...Rh6+!
- threat
- 1.Qxg5?
- threat
- 2.Qe7#
- 2.Qxg6#
- 1...Sf5
- 2.Qxf5#
- 1...Rf6
- 2.Rxf6#
- 2.Qxf6#
- 1...Rh6
- 2.Rxh6#
- 2.Qxh6#
- 2.Qe7#
- 2.Qg8#
- 1...Rg7
- 2.Rf6#
- 2.Qf6#
- 1...Rg8
- 2.Rf6#
- 2.Qf6#
- 2.Qe7#
- 2.Qxg8#
- 1...Sd5
- 2.Qf5#
- 1...Rxg5!
- threat
- 1.Qf8?
- threat
- 2.Qe7#
- 1...Rg7
- 2.Qf6#
- 1...Sd5
- 2.Qf5#
- 1...Sf5
- 2.Qxf5#
- 1...Kxe5!
- threat
- 1.Ba4?
- Keys
- 1.Re2!
- 1...Sf3
- 2.Qf7#
- 1...Rf6
- 2.Qxf6#
- 1...Rh6
- 2.Rxh6#
- 1...Rg7
- 2.Qf6#
- 1...Rg8
- 2.Qf6#
- 1...Sd1
- 2.Qxg4#
- 1...Sf1
- 2.Qxg4#
- 1...Sc2
- 2.Qxg4#
- 1...Sg2
- 2.Qxg4#
- 1...Sc4
- 2.Qxg4#
- 1...Sd5
- 2.Qxg4#
- 1...Sf5
- 2.Qc4#
- 1...Sh3
- 2.Qf7#
- 1...Se4
- 2.Qf7#
- 1...Sf7
- 2.Qxf7#
- 1...Sh7
- 2.Qf7#
- 1...Sf3
- 1.Re2!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 7
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(e);N_GUARD::QAR1(E),XR(e)
- R(e);OGATEB,P_PINR(G)::R(G),XR(e)
- R(e);N_GUARD::QAR1(E)
- S(a);N_GUARD::QAB1(E)
- S(a);N_GUARD::QAB1(E),XS(a)
- S(c);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Tries
- Try
- B(I);
- Vars
- R(e);N_GUARD::QAR1(E),XR(e)
- S(a);N_GUARD::QAB1(E),XS(a)
- R(e);OGATEB,P_PINR(G)::R(G),XR(e)
- R(e);N_GUARD::QAR1(E)
- S(a);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- S(c);
- Try
- B(I);
- Vars
- R(e);N_GUARD::QAR1(E),XR(e)
- S(a);N_GUARD::QAB1(E),XS(a)
- R(e);OGATEB,P_PINR(G)::R(G),XR(e)
- R(e);N_GUARD::QAR1(E)
- S(a);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- S(c);
- Try
- B(I);
- Vars
- R(e);N_GUARD::QAR1(E),XR(e)
- S(a);N_GUARD::QAB1(E),XS(a)
- R(e);OGATEB,P_PINR(G)::R(G),XR(e)
- R(e);N_GUARD::QAR1(E)
- S(a);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- S(c);
- Try
- B(I);XR(e)
- Vars
- S(c);N_GUARD::QAB1(E)
- S(a);N_GUARD::QAB1(E)
- S(a);N_GUARD::QAB1(E),XS(a)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- K(d);S_FLIGHT
- Try
- B(I);CHECK
- Vars
- S(c);OGATE,XB(I)::QAB1(E),XS(c)
- Refutation
- K(d);S_FLIGHT
- Try
- R(B);
- Vars
- S(c);N_GUARD::QAB1(E)
- R(e);N_GUARD::QAR1(E),XR(e)
- R(e);OGATEB,P_PINR(G)::R(G),XR(e)
- R(e);N_GUARD::QAR1(E)
- S(a);N_GUARD::QAB1(E)
- S(a);N_GUARD::QAB1(E),XS(a)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- S(a);XR(B)
- Try
- R(B);
- Vars
- S(c);N_GUARD,XR(B)::QAB1(E)
- R(e);N_GUARD::QAR1(E),XR(e)
- R(e);OGATEB,P_PINR(G)::R(G),XR(e)
- R(e);N_GUARD::QAR1(E)
- S(a);N_GUARD::QAB1(E)
- S(a);N_GUARD::QAB1(E),XS(a)
- S(c);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- P(b);XR(B)
- Try
- R(G);XS(c)
- Threat
- DUALS(2)
- Vars
- R(e);N_GUARD,XR(G)::QAR1(E)
- R(e);N_GUARD::QAR1(E),XR(e)
- R(e);N_GUARD::QAR1(E)
- Refutation
- R(e);CHECK
- Try
- Q(E);XS(c)
- Threat
- DUALS(2)
- Vars
- S(a);N_GUARD::QAB1(E),XS(a)
- S(a);N_GUARD::QAB1(E)
- Refutation
- R(e);XQ(E)
- Try
- Q(E);
- Threat
- QAR1(E)
- Vars
- R(e);N_GUARD::QAR1(E)
- S(a);N_GUARD::QAB1(E)
- S(a);N_GUARD::QAB1(E),XS(a)
- Refutation
- K(d);P-FLIGHT,P_SPINS(c),XB(F)
- Try
- Actual
- R(B);
- Vars
- S(c);N_GUARD::QAB1(E)
- R(e);N_GUARD::QAR1(E),XR(e)
- R(e);OGATEB,P_PINR(G)::R(G),XR(e)
- R(e);N_GUARD::QAR1(E)
- S(a);N_GUARD::QAB(E),XP(b)
- S(a);N_GUARD,SBLOCK::QAB(E)
- S(c);N_GUARD::QAB1(E),XS(c)
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).