MESON Chess Problem Database
Problem Display
PID: 212957 (3R2b1/KN2Q3/1pB1n3/p5b1/P1kN4/6Rr/1qP5/4B3 w - - 0 1)
Nobre, R
The Problemist, 1987
#2
10 + 8
SOLUTION
- SOUND
- Sets
- 1...Qa1
- 2.Bb5#
- 1...Qc1
- 2.Bb5#
- 1...Qa3
- 2.Bb5#
- 1...Qc3
- 2.Bb5#
- 1...Qxd4
- 2.Bb5#
- 1...Qa2
- 2.Bb5#
- 1...Qxc2
- 2.Bb5#
- 1...Qb3
- 2.cxb3#
- 1...Qb5
- 2.Bxb5#
- 1...Bh7
- 2.Qxe6#
- 1...Sc7
- 2.Qe2#
- 1...Sg7
- 2.Qe2#
- 1...Sf8
- 2.Qe2#
- 1...b5
- 2.Sxa5#
- 1...Qa1
- Tries
- 1.Sb3?
- threat
- 2.Sd6#
- 2.Bb5#
- 2.Bd5#
- 1...Qxb3
- 2.cxb3#
- 1...Bxe7
- 2.Bb5#
- 2.Bd5#
- 1...Sxd8
- 2.Sd6#
- 2.Qe2#
- 1...Qa3
- 2.Bb5#
- 2.Bd5#
- 1...Qc3
- 2.Bb5#
- 2.Bd5#
- 1...Qd4
- 2.Bb5#
- 1...Bd2
- 2.Sxd2#
- 2.Bb5#
- 2.Bd5#
- 1...Bf4
- 2.Bb5#
- 2.Bd5#
- 1...Sd4
- 2.Sd6#
- 1...Sf4
- 2.Sd2#
- 2.Sd6#
- 2.Bb5#
- 1...Sc5
- 2.Sd6#
- 2.Bb5#
- 1...Sc7
- 2.Sd6#
- 2.Qe2#
- 1...Sg7
- 2.Sd6#
- 2.Bb5#
- 2.Qe2#
- 1...Sf8
- 2.Sd6#
- 2.Bb5#
- 2.Qe2#
- 1...b5
- 2.S3xa5#
- 2.S7xa5#
- 2.Sd6#
- 2.Bxb5#
- 2.Bd5#
- 1...Qe5!
- threat
- 1.Sb5?
- threat
- 2.Bd5#
- 1...Qxb5
- 2.Bxb5#
- 1...Sxd8
- 2.Qe2#
- 1...Qe5
- 2.Sa3#
- 1...Qd4
- 2.Sa3#
- 1...Sd4
- 2.S5d6#
- 1...Sc5
- 2.S7d6#
- 1...Sc7
- 2.Qe2#
- 1...Sg7
- 2.Qe2#
- 1...Sf8
- 2.Qe2#
- 1...Sf4!
- threat
- 1.Sf5?
- threat
- 2.Bd5#
- 1...Sxd8
- 2.Qe2#
- 1...Qd4
- 2.Bb5#
- 1...Qb5
- 2.Bxb5#
- 1...Sd4
- 2.Sfd6#
- 1...Sf4
- 2.Se3#
- 1...Sc5
- 2.Sbd6#
- 1...Sc7
- 2.Qe2#
- 1...Sg7
- 2.Qe2#
- 1...Sf8
- 2.Qe2#
- 1...Qe5!
- threat
- 1.Sxe6?
- threat
- 2.Sd6#
- 2.Bd5#
- 1...Bxe7
- 2.Bd5#
- 1...Bxe6
- 2.Qxe6#
- 1...Qa3
- 2.Bb5#
- 2.Bd5#
- 2.Rd4#
- 1...Qc3
- 2.Bb5#
- 2.Bd5#
- 1...Qd4
- 2.Bb5#
- 2.Rxd4#
- 1...Qb4
- 2.Bd5#
- 2.Rd4#
- 1...Qb5
- 2.Sd6#
- 2.Bxb5#
- 2.Rd4#
- 1...Bd2
- 2.Bd5#
- 1...Bf4
- 2.Bd5#
- 1...Qe5!
- threat
- 1.Rc3+?
- 1...Qxc3
- 2.Bb5#
- 1...Rxc3!
- 1...Qxc3
- 1.Qb4+?
- 1...axb4
- 2.Bb5#
- 1...Qxb4!
- 1...axb4
- 1.Qc5+?
- 1...bxc5
- 2.Sxa5#
- 1...Sxc5!
- 1...bxc5
- 1.Sb3?
- Keys
- 1.Sf3!
- threat
- 2.Bd5#
- 1...Qxc2
- 2.Se5#
- 1...Sxd8
- 2.Qe2#
- 1...Bd2
- 2.Sxd2#
- 1...Qe5
- 2.Sxe5#
- 1...Qd4
- 2.Bb5#
- 1...Qb5
- 2.Bxb5#
- 1...Sd4
- 2.Se5#
- 1...Sf4
- 2.Sd2#
- 1...Sc5
- 2.Sd6#
- 1...Sc7
- 2.Qe2#
- 1...Sg7
- 2.Qe2#
- 1...Sf8
- 2.Qe2#
- threat
- 1.Sf3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 6
- REMOVED MATES = 8
- Sets
- Q(a);N_GUARD::B(F)
- Q(a);N_GUARD,XS(E)::B(F)
- Q(a);N_GUARD,XP(B)::B(F)
- Q(a);OGATE::P(B),XQ(a)
- Q(a);N_GUARD::B(F),XQ(a)
- B(h);N_GUARD::QAB(I),XS(g)
- S(g);OGATE::QAB(I)
- P(f);N_GUARD::S(H),XP(d)
- Tries
- Try
- S(E);
- Threat
- DUALS(3)
- Vars
- Q(a);OGATE,XS(E)::P(B),XQ(a)
- Q(a);::B(F)
- S(g);::S(H)
- Refutation
- Q(a);
- Try
- S(E);
- Threat
- B(F)
- Vars
- Q(a);OGATE,XS(E)::B(F),XQ(a)
- S(g);OGATE,XR(J)::QAB(I)
- Q(a);N_GUARD::S(E)
- S(g);SBLOCK::S(E)
- S(g);SBLOCK::S(H)
- S(g);OGATE::QAB(I)
- Refutation
- S(g);
- Try
- S(E);
- Threat
- B(F)
- Vars
- S(g);OGATE,XR(J)::QAB(I)
- Q(a);N_GUARD::B(F)
- Q(a);N_GUARD::B(F),XQ(a)
- S(g);SBLOCK::S(E)
- S(g);S_CUTB(e)::S(E)
- S(g);SBLOCK::S(H)
- S(g);OGATE::QAB(I)
- Refutation
- Q(a);
- Try
- S(E);XS(g)
- Threat
- DUALS(2)
- Vars
- B(e);XQ(I)::B(F)
- B(h);OGATE,XS(E)::QAB(I),XB(h)
- B(e);::B(F)
- Refutation
- Q(a);
- Try
- R(C);CHECK
- Vars
- Q(a);XR(C)::B(F)
- Refutation
- R(b);XR(C)
- Try
- Q(I);CHECK
- Vars
- P(d);XQ(I)::B(F)
- Refutation
- Q(a);XQ(I)
- Try
- Q(I);CHECK
- Vars
- P(f);SBLOCK,XQ(I)::S(H),XP(d)
- Refutation
- S(g);XQ(I)
- Try
- Actual
- S(E);
- Threat
- B(F)
- Vars
- Q(a);N_GUARD,XP(B)::S(E)
- S(g);OGATE,XR(J)::QAB(I)
- B(e);N_GUARD::S(E),XB(e)
- Q(a);N_GUARD::S(E),XQ(a)
- Q(a);N_GUARD::B(F)
- Q(a);N_GUARD::B(F),XQ(a)
- S(g);S_CUTQ(a)::S(E)
- S(g);S_CUTB(e)::S(E)
- S(g);SBLOCK::S(H)
- S(g);OGATE::QAB(I)
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).