MESON Chess Problem Database
Problem Display
PID: 218492 (1r6/1pRpp2p/nP1kq1nR/N7/3PP3/2BK2NB/8/5Q2 w - - 0 1)
Studd, Alnod Ernest
English Mechanic and World of Science, 1882
(First published on Fri Sep 29 1882)
#2
11 + 9
| 6490 | yacpdb | 2020 |
| 15239 | Valois Notebooks | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Qa2
- 2.Rxd7#
- 1...Qb3
- 2.Rxd7#
- 1...Qc4+
- 2.Sxc4#
- 1...Qd5
- 2.Rxd7#
- 1...Qf7
- 2.Rxd7#
- 1...Qg8
- 2.Rxd7#
- 1...Qe5
- 2.Sc4#
- 2.Rxd7#
- 2.dxe5#
- 1...Qf6
- 2.Sc4#
- 2.Rxd7#
- 1...Ra8
- 2.Sxb7#
- 1...Rc8
- 2.Sxb7#
- 1...Rd8
- 2.Sxb7#
- 1...Re8
- 2.Sxb7#
- 1...Rf8
- 2.Sxb7#
- 1...Rg8
- 2.Sxb7#
- 1...Rh8
- 2.Sxb7#
- 1...Sb4+
- 2.Bxb4#
- 1...Sc5+
- 2.dxc5#
- 1...Sxc7
- 2.Bb4#
- 1...Sf4+
- 2.Qxf4#
- 1...Sh4
- 2.Sc4#
- 2.Qf4#
- 1...Se5+
- 2.dxe5#
- 1...Sf8
- 2.Sf5#
- 2.Sc4#
- 2.Qf4#
- 1...Sh8
- 2.Sf5#
- 2.Sc4#
- 2.Qf4#
- 1...Qa2
- Tries
- 1.Bb4+?
- 1...Sc5+
- 2.Bxc5#
- 1...Sxb4+!
- 1...Sc5+
- 1.Rxg6?
- threat
- 2.Sf5#
- 2.Sc4#
- 2.Qf4#
- 1...Sb4+
- 2.Bxb4#
- 1...Sc5+
- 2.dxc5#
- 1...Qxg6
- 2.Sc4#
- 2.Rxd7#
- 1...Sxc7
- 2.Sf5#
- 2.Bb4#
- 2.Qf4#
- 1...Qf6
- 2.Sc4#
- 2.Rxd7#
- 1...Rf8
- 2.Sc4#
- 2.Sxb7#
- 1...hxg6!
- threat
- 1.Qf4+?
- 1...Qe5
- 2.Sc4#
- 2.Rxd7#
- 2.Qxe5#
- 2.dxe5#
- 1...Se5+
- 2.Qxe5#
- 2.dxe5#
- 1...Sxf4+!
- 1...Qe5
- 1.Qf5?
- 1...Qc4+
- 2.Sxc4#
- 1...Qxe4+
- 2.Sxe4#
- 1...Sb4+
- 2.Bxb4#
- 1...Sc5+
- 2.Qxc5#
- 2.dxc5#
- 1...Sf4+
- 2.Qxf4#
- 1...Se5+
- 2.Qxe5#
- 2.dxe5#
- 1...Sxc7
- 2.Bb4#
- 2.Qc5#
- 1...Qa2
- 2.Rxd7#
- 2.Qxd7#
- 2.Qe5#
- 1...Qb3
- 2.Rxd7#
- 2.Qxd7#
- 2.Qe5#
- 1...Qd5
- 2.Rxd7#
- 2.Qxd7#
- 2.Qxd5#
- 1...Qf7
- 2.Rxd7#
- 2.Qxd7#
- 2.Qe5#
- 1...Qg8
- 2.Rxd7#
- 2.Qxd7#
- 2.Qe5#
- 1...Qe5
- 2.Sc4#
- 2.Rxd7#
- 2.Qxd7#
- 2.Qxe5#
- 2.dxe5#
- 1...Qf6
- 2.Sc4#
- 2.Rxd7#
- 2.Qxd7#
- 2.Qd5#
- 1...Ra8
- 2.Sxb7#
- 1...Rc8
- 2.Sxb7#
- 1...Rd8
- 2.Sxb7#
- 1...Re8
- 2.Sxb7#
- 1...Rf8
- 2.Sxb7#
- 1...Rg8
- 2.Sxb7#
- 1...Rh8
- 2.Sxb7#
- 1...Sh4
- 2.Sc4#
- 2.Qf4#
- 2.Qd5#
- 2.Qe5#
- 1...Sf8
- 2.Sc4#
- 2.Qf4#
- 2.Qd5#
- 2.Qe5#
- 1...Sh8
- 2.Sc4#
- 2.Qf4#
- 2.Qd5#
- 2.Qe5#
- 1...Qxf5!
- 1...Qc4+
- 1.Qf6?
- threat
- 2.Sf5#
- 2.Sc4#
- 1...Sb4+
- 2.Bxb4#
- 1...Sc5+
- 2.dxc5#
- 1...Sf4+
- 2.Qxf4#
- 1...Se5+
- 2.Qxe5#
- 2.dxe5#
- 1...Qxf6
- 2.Sc4#
- 2.Rxd7#
- 1...Sxc7
- 2.Sf5#
- 2.Bb4#
- 1...Sh4
- 2.Sc4#
- 2.Qe5#
- 2.Qf4#
- 1...exf6!
- threat
- 1.e5+?
- 1...Kd5
- 2.Bg2#
- 2.Qg2#
- 2.Qh1#
- 2.Qf3#
- 1...Qxe5
- 2.Rxd7#
- 1...Sxe5+!
- 1...Kd5
- 1.Bb4+?
- Keys
- 1.Qf7!
- 1...Qc4+
- 2.Sxc4#
- 1...Qxe4+
- 2.Sxe4#
- 1...Sb4+
- 2.Bxb4#
- 1...Sc5+
- 2.dxc5#
- 1...Sf4+
- 2.Qxf4#
- 1...Se5+
- 2.dxe5#
- 1...Qxh3
- 2.Sc4#
- 2.Qd5#
- 2.e5#
- 1...Qxf7
- 2.Rxd7#
- 1...Sxc7
- 2.Bb4#
- 1...Qa2
- 2.Sf5#
- 2.Rxd7#
- 2.e5#
- 1...Qb3
- 2.Sf5#
- 2.Rxd7#
- 2.e5#
- 1...Qg4
- 2.Sc4#
- 2.Qd5#
- 2.e5#
- 1...Qd5
- 2.Rxd7#
- 2.Qxd5#
- 1...Qf5
- 2.Sxf5#
- 2.Sc4#
- 1...Qe5
- 2.Sc4#
- 2.Rxd7#
- 2.dxe5#
- 1...Qf6
- 2.Sc4#
- 2.Rxd7#
- 2.Qd5#
- 1...Ra8
- 2.Sxb7#
- 1...Rc8
- 2.Sxb7#
- 1...Rd8
- 2.Sxb7#
- 1...Re8
- 2.Sxb7#
- 1...Rf8
- 2.Sxb7#
- 1...Rg8
- 2.Sxb7#
- 1...Rh8
- 2.Sxb7#
- 1...Sh4
- 2.Sc4#
- 2.Qf4#
- 1...Sf8
- 2.Sf5#
- 2.Sc4#
- 2.Qf4#
- 1...Sh8
- 2.Sf5#
- 2.Sc4#
- 2.Qf4#
- 1...Qc4+
- 1.Qf7!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 4
- Sets
- Q(c);N_GUARD,P_SPINS(d)::R1(K),XP(f)
- Q(c);N_GUARD,P_PINB(B),P_SPINS(d)::R1(K),XP(f)
- Q(c);CHECK,N_GUARD,P_SPINS(d)::S(H),XQ(c)
- Q(c);N_GUARD,P_PINP(F),P_SPINS(d)::R1(K),XP(f)
- R(i);N_GUARD::S(H),XP(e)
- S(a);CHECK,N_GUARD::B(B),XS(a)
- S(a);CHECK,OGATE::P(F),XS(a)
- S(a);N_GUARD,XR(K)::B(B)
- S(d);CHECK,N_GUARD,P_SPINQ(c)::QAB(A),XS(d)
- S(d);CHECK,OGATE,P_SPINQ(c)::P(F),XS(d)
- Tries
- Try
- B(B);CHECK
- Vars
- S(a);CHECK,N_GUARD,P_SPINS(a)::B(B),XS(a)
- Refutation
- S(a);CHECK,XB(B)
- Try
- R(J);P_PINQ(c),XS(d)
- Threat
- DUALS(3)
- Vars
- S(a);CHECK,N_GUARD::B(B),XS(a)
- S(a);CHECK,OGATE::P(F),XS(a)
- Refutation
- P(h);N_SPINQ(c),XR(J)
- Try
- Q(A);CHECK
- Refutation
- S(d);CHECK,P_SPINQ(c),XQ(A)
- Try
- Q(A);
- Vars
- Q(c);CHECK,N_GUARD,P_SPINS(d)::S(H),XQ(c)
- Q(c);CHECK,P_SPINS(d),XP(G)::S(D),XQ(c)
- S(a);CHECK,N_GUARD::B(B),XS(a)
- S(d);CHECK,N_GUARD,P_SPINQ(c)::QAB(A),XS(d)
- R(i);N_GUARD::S(H),XP(e)
- Refutation
- Q(c);P_PINP(G),P_SPINS(d),XQ(A)
- Try
- Q(A);P_PINQ(c)
- Threat
- DUALS(2)
- Vars
- S(a);CHECK,N_GUARD::B(B),XS(a)
- S(a);CHECK,OGATE::P(F),XS(a)
- S(d);CHECK,N_GUARD::QAB(A),XS(d)
- Refutation
- P(g);N_SPINQ(c),XQ(A)
- Try
- P(G);CHECK
- Vars
- Q(c);P_SPINS(d),XP(G)::R1(K),XP(f)
- Refutation
- S(d);CHECK,P_SPINQ(c),XP(G)
- Try
- Actual
- Q(A);
- Vars
- Q(c);CHECK,N_GUARD,P_SPINS(d)::S(H),XQ(c)
- Q(c);CHECK,P_SPINS(d),XP(G)::S(D),XQ(c)
- S(a);CHECK,N_GUARD::B(B),XS(a)
- S(a);CHECK,OGATE::P(F),XS(a)
- S(d);CHECK,N_GUARD,P_SPINQ(c)::QAB(A),XS(d)
- S(d);CHECK,OGATE,P_SPINQ(c)::P(F),XS(d)
- Q(c);N_GUARD,P_SPINS(d),XQ(A)::R1(K),XP(f)
- S(a);N_GUARD,XR(K)::B(B)
- R(i);N_GUARD::S(H),XP(e)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).