MESON Chess Problem Database
Problem Display
PID: 40376 (8/N1K5/b7/2R1n3/p1nk4/B7/4Q3/3N4 w - - 0 1)
de Brunner, Oscar F
Problem Observer, 1972
#2
6 + 5
SOLUTION
- SOUND
- Sets
- 1...Bb5
- 2.Sxb5#
- 1...Bb7
- 2.Sb5#
- 1...Bc8
- 2.Sb5#
- 1...Sb2
- 2.Qe3#
- 1...Sd2
- 2.Qe3#
- 1...Sxa3
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...Sa5
- 2.Qe3#
- 1...Sb6
- 2.Qe3#
- 1...Sd6
- 2.Qe3#
- 1...Sd3
- 2.Sc6#
- 1...Sf3
- 2.Sc6#
- 1...Sg4
- 2.Sc6#
- 1...Sc6
- 2.Sxc6#
- 1...Sg6
- 2.Sc6#
- 1...Sd7
- 2.Sc6#
- 1...Sf7
- 2.Sc6#
- 1...Bb5
- Tries
- 1.Kb8?
- 1...Sc6+
- 2.Sxc6#
- 1...Sxa3
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...Bb5
- 2.Sxb5#
- 1...Bb7
- 2.Sb5#
- 1...Bc8
- 2.Sb5#
- 1...Sb2
- 2.Qe3#
- 1...Sd2
- 2.Qe3#
- 1...Sa5
- 2.Qe3#
- 1...Sb6
- 2.Qe3#
- 1...Sd6
- 2.Qe3#
- 1...Sd3
- 2.Sc6#
- 1...Sf3
- 2.Sc6#
- 1...Sg4
- 2.Sc6#
- 1...Sg6
- 2.Sc6#
- 1...Sf7
- 2.Sc6#
- 1...Sd7+!
- 1...Sc6+
- 1.Kd8?
- 1...Sc6+
- 2.Sxc6#
- 1...Sxa3
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...Bb5
- 2.Sxb5#
- 1...Bb7
- 2.Sb5#
- 1...Bc8
- 2.Sb5#
- 1...Sb2
- 2.Qe3#
- 1...Sd2
- 2.Qe3#
- 1...Sa5
- 2.Qe3#
- 1...Sb6
- 2.Qe3#
- 1...Sd6
- 2.Qe3#
- 1...Sd3
- 2.Sc6#
- 1...Sf3
- 2.Sc6#
- 1...Sg4
- 2.Sc6#
- 1...Sg6
- 2.Sc6#
- 1...Sd7
- 2.Sc6#
- 1...Sf7+!
- 1...Sc6+
- 1.Bb2+?
- 1...Sxb2
- 2.Qe3#
- 1...Kxc5!
- 1...Sxb2
- 1.Bb4?
- 1...Se3
- 2.Qxe3#
- 1...Bb5
- 2.Sxb5#
- 1...Bb7
- 2.Sb5#
- 1...Bc8
- 2.Sb5#
- 1...Sb2
- 2.Qe3#
- 1...Sd2
- 2.Qe3#
- 1...Sa3
- 2.Qe3#
- 1...Sa5
- 2.Qe3#
- 1...Sb6
- 2.Qe3#
- 1...Sd6
- 2.Qe3#
- 1...Sd3
- 2.Sc6#
- 1...Sf3
- 2.Sc6#
- 1...Sg4
- 2.Sc6#
- 1...Sc6
- 2.Sxc6#
- 1...Sg6
- 2.Sc6#
- 1...Sd7
- 2.Sc6#
- 1...Sf7
- 2.Sc6#
- 1...a3!
- 1...Se3
- 1.Rxe5?
- threat
- 2.Sc6#
- 2.Bc5#
- 2.Qe4#
- 1...Sxa3
- 2.Sc6#
- 2.Qe4#
- 1...Se3
- 2.Sc6#
- 2.Bb2#
- 1...Bb5
- 2.Sxb5#
- 2.Bc5#
- 2.Qe4#
- 1...Bb7
- 2.Sb5#
- 2.Bc5#
- 1...Sd2
- 2.Sc6#
- 2.Bb2#
- 2.Bc5#
- 1...Sa5
- 2.Bb2#
- 2.Bc5#
- 2.Qe4#
- 1...Sd6
- 2.Sc6#
- 2.Bb2#
- 2.Bc5#
- 1...Sxe5!
- threat
- 1.Qf3?
- threat
- 2.Rd5#
- 2.Qd5#
- 1...Sxa3
- 2.Qd5#
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...Bb7
- 2.Sb5#
- 1...Sb2
- 2.Qd5#
- 2.Qe3#
- 1...Sd2
- 2.Qd5#
- 2.Qe3#
- 1...Sa5
- 2.Qd5#
- 2.Qe3#
- 1...Sb6
- 2.Qe3#
- 1...Sd6
- 2.Qd5#
- 2.Qe3#
- 1...Sxf3!
- threat
- 1.Kb8?
- Keys
- 1.Sf2!
- 1...Kc3
- 2.Qb2#
- 1...Sxa3
- 2.Qxe5#
- 1...Bb5
- 2.Sxb5#
- 1...Bb7
- 2.Sb5#
- 1...Bc8
- 2.Sb5#
- 1...Sb2
- 2.Qe4#
- 2.Qxe5#
- 1...Sd2
- 2.Qxe5#
- 1...Se3
- 2.Qb2#
- 1...Sa5
- 2.Qe4#
- 2.Qxe5#
- 1...Sb6
- 2.Qe4#
- 2.Qxe5#
- 1...Sd6
- 2.Qxe5#
- 1...Sd3
- 2.Qxd3#
- 1...Sf3
- 2.Qd3#
- 1...Sg4
- 2.Qd3#
- 1...Sc6
- 2.Qd3#
- 1...Sg6
- 2.Qd3#
- 1...Sd7
- 2.Qd3#
- 1...Sf7
- 2.Qd3#
- 1...Kc3
- 1.Sf2!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 11
- ADDED MATES = 1
- REMOVED MATES = 3
- Sets
- B(e);N_GUARD::S(E),XB(e)
- B(e);N_GUARD::S(E)
- S(b);N_GUARD::QAB1(B)
- S(b);N_GUARD,XB(C)::QAB1(B)
- S(b);N_GUARD::QAB1(B),XS(b)
- S(d);N_GUARD::S(E)
- S(d);N_GUARD::S(E),XS(d)
- Tries
- Try
- K(F);S_FLIGHT
- Vars
- S(d);CHECK,N_GUARD::S(E),XS(d)
- S(b);N_GUARD,XB(C)::QAB1(B)
- S(b);N_GUARD::QAB1(B),XS(b)
- B(e);N_GUARD::S(E),XB(e)
- B(e);N_GUARD::S(E)
- S(b);N_GUARD::QAB1(B)
- S(d);N_GUARD::S(E)
- Refutation
- S(d);CHECK
- Try
- K(F);S_FLIGHT
- Vars
- S(d);CHECK,N_GUARD::S(E),XS(d)
- S(b);N_GUARD,XB(C)::QAB1(B)
- S(b);N_GUARD::QAB1(B),XS(b)
- B(e);N_GUARD::S(E),XB(e)
- B(e);N_GUARD::S(E)
- S(b);N_GUARD::QAB1(B)
- S(d);N_GUARD::S(E)
- Refutation
- S(d);CHECK
- Try
- B(C);CHECK
- Vars
- S(b);XB(C)::QAB1(B)
- Refutation
- K(c);S_FLIGHT,XR(D)
- Try
- B(C);
- Vars
- S(b);N_GUARD::QAB1(B),XS(b)
- B(e);N_GUARD::S(E),XB(e)
- B(e);N_GUARD::S(E)
- S(b);N_GUARD::QAB1(B)
- S(d);N_GUARD::S(E)
- S(d);N_GUARD::S(E),XS(d)
- Refutation
- P(a);
- Try
- R(D);XS(d)
- Threat
- DUALS(3)
- Refutation
- S(b);XR(D)
- Try
- Q(B);
- Threat
- DUALS(2)
- Vars
- S(b);N_GUARD::QAB1(B),XS(b)
- B(e);N_GUARD::S(E)
- S(b);N_GUARD::QAB1(B)
- Refutation
- S(d);XQ(B)
- Try
- Actual
- S(A);
- Vars
- K(c);P_SPINS(b),S_FLIGHT::QAB1(B)
- S(b);N_GUARD,XB(C)::QAB1(B),XS(d)
- B(e);N_GUARD::S(E),XB(e)
- B(e);N_GUARD::S(E)
- S(b);N_GUARD::QAB1(B),XS(d)
- S(b);N_GUARD,SBLOCK::QAB(B)
- S(d);N_GUARD::QAR1(B),XS(d)
- S(d);N_GUARD::QAR1(B)
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).