MESON Chess Problem Database
Problem Display
PID: 7603 (r3q3/6Q1/1R5r/pPPk1nN1/2R2P2/1BB1p3/K1N5/8 w - - 0 1)
Narayanan, Chithathuz Gopatan Sathya
3rd Prize, The Problemist, 1991/II
#2
11 + 7
SOLUTION
- SOUND
- Sets
- 1...Qxb5
- 2.Qe5#
- 1...Qh5
- 2.Qe5#
- 1...Qc6
- 2.Qe5#
- 1...Qg6
- 2.Qe5#
- 1...Qd7
- 2.Qe5#
- 1...Qf7
- 2.Qe5#
- 1...Qe5
- 2.Qxe5#
- 1...Qc8
- 2.Qe5#
- 1...Qd8
- 2.Qe5#
- 1...Qf8
- 2.Qe5#
- 1...Qg8
- 2.Qe5#
- 1...Sg3
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sh4
- 2.Qd4#
- 1...Sd6
- 2.Qd4#
- 1...Se7
- 2.Sxe3#
- 2.Qd4#
- 2.Qe5#
- 1...a4
- 2.Sb4#
- 1...Qxb5
- Tries
- 1.Sxe3+?
- 1...Sxe3
- 2.Qd4#
- 1...Qxe3!
- 1...Sxe3
- 1.Se4?
- threat
- 2.Ra4#
- 2.Rb4#
- 2.Rd4#
- 1...Qxb5
- 2.Rd4#
- 2.Qe5#
- 1...Sd4
- 2.Rxd4#
- 2.Qxd4#
- 1...Sd6
- 2.Rd4#
- 1...a4
- 2.Sb4#
- 2.Rxa4#
- 2.Rd4#
- 1...Qxe4!
- threat
- 1.Ba1?
- threat
- 2.Rc3#
- 1...Qxb5
- 2.Qe5#
- 1...Sd4
- 2.Qxd4#
- 1...Sd6
- 2.Qd4#
- 1...a4
- 2.Sb4#
- 1...Qe4!
- threat
- 1.Be1?
- threat
- 2.Rc3#
- 1...Qxb5
- 2.Qe5#
- 1...Sd4
- 2.Qxd4#
- 1...Sd6
- 2.Qd4#
- 1...a4
- 2.Sb4#
- 1...Qe4!
- threat
- 1.Bb2?
- threat
- 2.Rc3#
- 1...Qxb5
- 2.Qe5#
- 1...Sd4
- 2.Qxd4#
- 1...Sd6
- 2.Qd4#
- 1...a4
- 2.Sb4#
- 1...Qe4!
- threat
- 1.Bd2?
- threat
- 2.Rc3#
- 1...Qxb5
- 2.Qe5#
- 1...Sd4
- 2.Qxd4#
- 1...Sd6
- 2.Qd4#
- 1...a4
- 2.Sb4#
- 1...Qe4!
- threat
- 1.Bb4?
- threat
- 2.Rc3#
- 2.Rd4#
- 2.Re4#
- 1...Qxb5
- 2.Rd4#
- 2.Qe5#
- 1...Qe4
- 2.Rd4#
- 2.Rxe4#
- 1...Sd4
- 2.Rxd4#
- 2.Qxd4#
- 1...Sd6
- 2.Rd4#
- 2.Qd4#
- 1...a4
- 2.Rd4#
- 1...axb4+!
- threat
- 1.Bd4?
- threat
- 2.Rc3#
- 2.Ra4#
- 2.Rb4#
- 1...Qxb5
- 2.Qe5#
- 1...Sxd4
- 2.Qxd4#
- 1...a4
- 2.Sb4#
- 2.Rxa4#
- 1...Sd6!
- threat
- 1.Bxa5?
- threat
- 2.Sb4#
- 2.Rc3#
- 1...Qxb5
- 2.Qe5#
- 1...Qe4
- 2.Sb4#
- 1...Rh2
- 2.Rc3#
- 1...Sd4
- 2.Sb4#
- 2.Qxd4#
- 1...Sd6
- 2.Sb4#
- 2.Qd4#
- 1...Rxa5+!
- threat
- 1.Be5?
- threat
- 2.Rc3#
- 1...Sd4
- 2.Sxe3#
- 1...Sd6
- 2.Sxe3#
- 1...a4
- 2.Sb4#
- 1...Qxb5!
- threat
- 1.Rc6?
- threat
- 2.Ra4#
- 2.Rb4#
- 2.Rd4#
- 2.Re4#
- 1...Qxc6
- 2.Qe5#
- 1...Qe4
- 2.Rd4#
- 2.Rxe4#
- 1...Sd4
- 2.Rxd4#
- 2.Qxd4#
- 1...Sd6
- 2.Rd4#
- 2.Qd4#
- 1...a4
- 2.Sb4#
- 2.Rxa4#
- 2.Rd4#
- 1...Rxc6!
- threat
- 1.Rd6+?
- 1...Sxd6
- 2.Qd4#
- 1...Rxd6!
- 1...Sxd6
- 1.Qc7?
- threat
- 2.Ra4#
- 2.Rb4#
- 2.Rd4#
- 2.Re4#
- 1...Qxb5
- 2.Rd4#
- 2.Qe5#
- 1...Qe4
- 2.Rd4#
- 2.Rxe4#
- 1...Qc6
- 2.Qe5#
- 1...Sd4
- 2.Rxd4#
- 1...Sd6
- 2.Rd4#
- 1...a4
- 2.Sb4#
- 2.Rxa4#
- 2.Rd4#
- 1...Rc6!
- threat
- 1.Sxe3+?
- Keys
- 1.Bf6!
- threat
- 2.Rc3#
- 1...Qxb5
- 2.Qf7#
- 1...Qe4
- 2.Qb7#
- 1...Sd4
- 2.Rd6#
- 1...Sd6
- 2.Rxd6#
- 1...a4
- 2.Sb4#
- threat
- 1.Bf6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 3
- ADDED MATES = 1
- REMOVED MATES = 12
- Sets
- Q(g);N_GUARD,XP(G)::QAR1(K)
- Q(g);N_GUARD::QAR1(K)
- Q(g);N_GUARD::QAR1(K),XQ(g)
- S(d);N_GUARD::QAR1(K)
- S(d);N_GUARD::QAR1(K),XS(d)
- P(b);N_GUARD::S(B)
- Tries
- Try
- S(B);CHECK,XP(a)
- Vars
- S(d);XS(B)::QAR1(K)
- Refutation
- Q(g);XS(B)
- Try
- S(I);
- Threat
- DUALS(3)
- Vars
- S(d);::B(C)+R(E),DCHECK
- Refutation
- Q(g);XS(I)
- Try
- B(D);
- Threat
- B(C)+R(E)
- Vars
- Q(g);N_GUARD,XP(G)::QAR1(K)
- S(d);N_GUARD::QAR1(K),XS(d)
- S(d);N_GUARD::QAR1(K)
- P(b);N_GUARD::S(B)
- Refutation
- Q(g);
- Try
- B(D);
- Threat
- B(C)+R(E)
- Vars
- Q(g);N_GUARD,XP(G)::QAR1(K)
- S(d);N_GUARD::QAR1(K),XS(d)
- S(d);N_GUARD::QAR1(K)
- P(b);N_GUARD::S(B)
- Refutation
- Q(g);
- Try
- B(D);
- Threat
- B(C)+R(E)
- Vars
- Q(g);N_GUARD,XP(G)::QAR1(K)
- S(d);N_GUARD::QAR1(K),XS(d)
- S(d);N_GUARD::QAR1(K)
- P(b);N_GUARD::S(B)
- Refutation
- Q(g);
- Try
- B(D);
- Threat
- B(C)+R(E)
- Vars
- Q(g);N_GUARD,XP(G)::QAR1(K)
- S(d);N_GUARD::QAR1(K),XS(d)
- S(d);N_GUARD::QAR1(K)
- P(b);N_GUARD::S(B)
- Refutation
- Q(g);
- Try
- B(D);
- Threat
- DUALS(3)
- Vars
- P(b);::B(C)+R(E),DCHECK
- Refutation
- P(b);CHECK,XB(D)
- Try
- B(D);
- Threat
- DUALS(3)
- Vars
- Q(g);N_GUARD,XP(G)::QAR1(K)
- S(d);OGATE,XB(D)::QAR1(K),XS(d)
- Refutation
- S(d);
- Try
- B(D);P_SPINB(D),XP(b)
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD,XP(G)::QAR1(K)
- Q(g);::S(B)
- R(e);P_PINS(B)::B(C)+R(E)
- Refutation
- R(f);CHECK,XB(D)
- Try
- B(D);
- Threat
- B(C)+R(E)
- Vars
- S(d);N_GUARD::S(B),XP(a)
- P(b);N_GUARD::S(B)
- Refutation
- Q(g);XP(G)
- Try
- R(J);
- Threat
- DUALS(4)
- Vars
- Q(g);N_GUARD,XR(J)::QAR1(K)
- Refutation
- R(e);XR(J)
- Try
- R(J);CHECK
- Vars
- S(d);XR(J)::QAR1(K)
- Refutation
- R(e);XR(J)
- Try
- Q(K);
- Threat
- DUALS(4)
- Vars
- Q(g);N_GUARD::QAR1(K)
- S(d);::B(C)+R(E),DCHECK,XS(d)
- S(d);::B(C)+R(E),DCHECK
- Refutation
- R(e);
- Try
- Actual
- B(D);
- Threat
- B(C)+R(E)
- Vars
- Q(g);N_GUARD,XP(G)::QAB(K)
- Q(g);N_GUARD::QAB(K)
- S(d);N_GUARD::R1(J)
- S(d);N_GUARD::R1(J),XS(d)
- P(b);N_GUARD::S(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).