MESON Chess Problem Database
Problem Display
PID: 16843 (2Q5/8/8/3k4/3pNnB1/3n4/4R2K/8 w - - 0 1)
Valve, Leo Erland
Tidskrift for Schack, 1943
#2
5 + 4
| 3713 | Snap | 2001 |
| 5454 | Near Snap | 2007 |
SOLUTION
- SOUND
- Sets
- 1...Ke5
- 2.Qf5#
- 1...Sc1
- 2.Qc5#
- 1...Se1
- 2.Qc5#
- 1...Sb2
- 2.Qc5#
- 1...Sf2
- 2.Qc5#
- 1...Sb4
- 2.Qc5#
- 1...Sc5
- 2.Qxc5#
- 1...Se5
- 2.Qc5#
- 1...Sxe2
- 2.Qe6#
- 1...Sg2
- 2.Qe6#
- 1...Sh3
- 2.Qe6#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Sg6
- 2.Qe6#
- 1...Ke5
- Tries
- 1.Kh1?
- 1...Ke5
- 2.Qf5#
- 1...Sxe2
- 2.Qe6#
- 1...Sc5
- 2.Qxc5#
- 1...Sc1
- 2.Qc5#
- 1...Se1
- 2.Qc5#
- 1...Sb2
- 2.Qc5#
- 1...Sb4
- 2.Qc5#
- 1...Se5
- 2.Qc5#
- 1...Sg2
- 2.Qe6#
- 1...Sh3
- 2.Qe6#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Sg6
- 2.Qe6#
- 1...Sf2+!
- 1...Ke5
- 1.Bh3?
- 1...Ke5
- 2.Qf5#
- 1...Sxe2
- 2.Qe6#
- 1...Sc5
- 2.Qxc5#
- 1...Sc1
- 2.Qc5#
- 1...Se1
- 2.Qc5#
- 1...Sb2
- 2.Qc5#
- 1...Sf2
- 2.Qc5#
- 1...Sb4
- 2.Qc5#
- 1...Se5
- 2.Qc5#
- 1...Sg2
- 2.Qe6#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Sg6
- 2.Qe6#
- 1...Sxh3!
- 1...Ke5
- 1.Bf5?
- 1...Sxe2
- 2.Qe6#
- 1...Sc5
- 2.Qxc5#
- 1...Sc1
- 2.Qc5#
- 1...Se1
- 2.Qc5#
- 1...Sb2
- 2.Qc5#
- 1...Sf2
- 2.Qc5#
- 1...Sb4
- 2.Qc5#
- 1...Se5
- 2.Qc5#
- 1...Sg2
- 2.Qe6#
- 1...Sh3
- 2.Qe6#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Sg6
- 2.Qe6#
- 1...Ke5!
- 1...Sxe2
- 1.Re1?
- 1...Ke5
- 2.Qf5#
- 1...Sc5
- 2.Qxc5#
- 1...Se2
- 2.Qe6#
- 1...Sc1
- 2.Qc5#
- 1...Sb2
- 2.Qc5#
- 1...Sf2
- 2.Qc5#
- 1...Sb4
- 2.Qc5#
- 1...Se5
- 2.Qc5#
- 1...Sg2
- 2.Qe6#
- 1...Sh3
- 2.Qe6#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Sg6
- 2.Qe6#
- 1...Sxe1!
- 1...Ke5
- 1.Re3?
- 1...Ke5
- 2.Qf5#
- 1...Sc5
- 2.Qxc5#
- 1...Sc1
- 2.Qc5#
- 1...Se1
- 2.Qc5#
- 1...Sb2
- 2.Qc5#
- 1...Sf2
- 2.Qc5#
- 1...Sb4
- 2.Qc5#
- 1...Se5
- 2.Qc5#
- 1...Se2
- 2.Qe6#
- 1...Sg2
- 2.Qe6#
- 1...Sh3
- 2.Qe6#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Sg6
- 2.Qe6#
- 1...dxe3!
- 1...Ke5
- 1.Qb7+?
- 1...Kc4
- 2.Rc2#
- 1...Ke5!
- 1...Kc4
- 1.Qd7+?
- 1...Ke5
- 2.Qf5#
- 2.Qd6#
- 1...Kc4!
- 1...Ke5
- 1.Qc6+?
- 1...Ke5
- 2.Qd6#
- 1...Kxc6!
- 1...Ke5
- 1.Qc7?
- threat
- 2.Sf6#
- 1...Sc5
- 2.Qxc5#
- 1...Sh5!
- threat
- 1.Qg8+?
- 1...Ke5
- 2.Qg5#
- 1...Se6
- 2.Qxe6#
- 1...Kc6!
- 1...Ke5
- 1.Kh1?
- Keys
- 1.Qa6!
- 1...Ke5
- 2.Qd6#
- 1...Sxe2
- 2.Qe6#
- 1...Sc1
- 2.Qb5#
- 1...Se1
- 2.Qb5#
- 1...Sb2
- 2.Qb5#
- 1...Sf2
- 2.Qb5#
- 1...Sb4
- 2.Qb5#
- 1...Sc5
- 2.Sf6#
- 1...Se5
- 2.Qb5#
- 1...Sg2
- 2.Qe6#
- 1...Sh3
- 2.Qe6#
- 1...Sh5
- 2.Qe6#
- 1...Se6
- 2.Qxe6#
- 1...Sg6
- 2.Qe6#
- 1...Ke5
- 1.Qa6!
Anticipated by 51849(1920), 23429(1924)
This anticipates 18147(1953), 108913(1970), 88777(1993), 16255(2000)
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 8
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- K(d);P-FLIGHT::QAR1(E)
- S(a);N_GUARD::QAR1(E)
- S(a);N_GUARD::QAR1(E),XS(a)
- S(a);N_GUARD,SBLOCK::QAR1(E)
- S(c);N_GUARD,XR(A)::QAB1(E)
- S(c);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Tries
- Try
- K(B);P-FLIGHT
- Vars
- K(d);P-FLIGHT::QAR1(E)
- S(c);N_GUARD,XR(A)::QAB1(E)
- S(a);N_GUARD::QAR1(E),XS(a)
- S(a);N_GUARD::QAR1(E)
- S(a);N_GUARD,SBLOCK::QAR1(E)
- S(c);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- S(a);CHECK
- Try
- B(D);
- Vars
- K(d);P-FLIGHT::QAR1(E)
- S(c);N_GUARD,XR(A)::QAB1(E)
- S(a);N_GUARD::QAR1(E),XS(a)
- S(a);N_GUARD::QAR1(E)
- S(a);N_GUARD,SBLOCK::QAR1(E)
- S(c);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- S(c);XB(D)
- Try
- B(D);
- Vars
- S(c);N_GUARD,XR(A)::QAB1(E)
- S(a);N_GUARD::QAR1(E),XS(a)
- S(a);N_GUARD::QAR1(E)
- S(a);N_GUARD,SBLOCK::QAR1(E)
- S(c);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- K(d);P-FLIGHT
- Try
- R(A);
- Vars
- K(d);P-FLIGHT::QAR1(E)
- S(a);N_GUARD::QAR1(E),XS(a)
- S(c);N_GUARD::QAB1(E)
- S(a);N_GUARD::QAR1(E)
- S(a);N_GUARD,SBLOCK::QAR1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- S(a);XR(A)
- Try
- R(A);
- Vars
- K(d);P-FLIGHT::QAR1(E)
- S(a);N_GUARD::QAR1(E),XS(a)
- S(a);N_GUARD::QAR1(E)
- S(a);N_GUARD,SBLOCK::QAR1(E)
- S(c);N_GUARD::QAB1(E)
- S(c);N_GUARD::QAB1(E),XS(c)
- Refutation
- P(b);XR(A)
- Try
- Q(E);CHECK
- Vars
- K(d);S_FLIGHT::R(A)
- Refutation
- K(d);P-FLIGHT
- Try
- Q(E);CHECK
- Refutation
- K(d);S_FLIGHT
- Try
- Q(E);CHECK
- Vars
- K(d);P-FLIGHT::QAB1(E)
- Refutation
- K(d);S_FLIGHT,XQ(E)
- Try
- Q(E);
- Threat
- S(C)
- Vars
- S(a);N_GUARD::QAR1(E),XS(a)
- Refutation
- S(c);
- Try
- Q(E);CHECK
- Vars
- K(d);P-FLIGHT::QAR2(E)
- S(c);N_GUARD,P_SPINS(c)::QAB1(E),XS(c)
- Refutation
- K(d);S_FLIGHT
- Try
- Actual
- Q(E);
- Vars
- K(d);P-FLIGHT::QAB1(E)
- S(c);N_GUARD,XR(A)::QAB1(E)
- S(a);N_GUARD::QAR2(E)
- S(a);SBLOCK::S(C)
- S(a);N_GUARD,SBLOCK::QAR2(E)
- S(c);N_GUARD::QAB1(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).