MESON Chess Problem Database
Problem Display
PID: 30954 (2N1R1r1/3pQ1B1/4n3/3rn1p1/4k1P1/7N/3R1PP1/5B1K w - - 0 1)
Langstaff, William A
The Problemist, 1927
#2
11 + 7
SOLUTION
- SOUND
- Sets
- 1...Ra5
- 2.Sd6#
- 1...Rb5
- 2.Sd6#
- 1...Rc5
- 2.Sd6#
- 1...Rd6
- 2.Sxd6#
- 1...Sd3
- 2.Re2#
- 1...Sd4
- 2.Bd3#
- 1...Sf4
- 2.Sxg5#
- 1...Ra5
- Tries
- 1.Bd3+?
- 1...Kd4
- 2.Qb4#
- 1...Sxd3
- 2.Re2#
- 1...Rxd3!
- 1...Kd4
- 1.Qc5?
- threat
- 2.Qe3#
- 2.Qxd5#
- 1...Rxd2
- 2.Qxe5#
- 1...Rxc5
- 2.Sd6#
- 1...Sxg4
- 2.Qxd5#
- 1...Rd3
- 2.Qxe5#
- 1...Rd4
- 2.Qxe5#
- 1...Rd6
- 2.Sxd6#
- 2.Qe3#
- 2.Qxe5#
- 1...Sd3
- 2.Re2#
- 2.Qe3#
- 2.f3#
- 1...Sc4
- 2.Qxd5#
- 2.f3#
- 1...Sd4
- 2.Bd3#
- 1...Sf4
- 2.Sxg5#
- 2.Qe3#
- 2.f3#
- 1...Sc7
- 2.Qe3#
- 2.f3#
- 1...Sxc5!
- threat
- 1.Qxg5?
- threat
- 2.Qe3#
- 2.Qf5#
- 1...Rxd2
- 2.Qxe5#
- 1...Sxg4
- 2.Qf4#
- 2.Qxg4#
- 2.Qxd5#
- 2.f3#
- 1...Sxg7
- 2.Qe3#
- 2.Qf4#
- 2.f3#
- 1...Rd3
- 2.Qxe5#
- 1...Rd4
- 2.Qxe5#
- 1...Rf8
- 2.Qe3#
- 1...Sd3
- 2.Re2#
- 2.Qe3#
- 2.f3#
- 1...Sf3
- 2.Qe3#
- 2.Qf4#
- 2.Qxd5#
- 1...Sc4
- 2.Qf4#
- 2.Qxd5#
- 2.f3#
- 1...Sc6
- 2.Qe3#
- 2.Qf4#
- 2.Qxd5#
- 2.f3#
- 1...Sg6
- 2.Qe3#
- 2.Qxd5#
- 2.f3#
- 1...Sf7
- 2.Qe3#
- 2.Qf4#
- 2.Qxd5#
- 2.f3#
- 1...Sd4
- 2.Bd3#
- 2.Qe3#
- 2.Qf4#
- 1...Sf4
- 2.Qxf4#
- 2.Qf5#
- 1...Sxg5!
- threat
- 1.Qf6?
- threat
- 2.Qf5#
- 1...Rxd2
- 2.Qxe5#
- 1...Sxg4
- 2.Qf3#
- 1...Sxg7
- 2.Sxg5#
- 2.Qf3#
- 1...Rd3
- 2.Qxe5#
- 1...Rd4
- 2.Qxe5#
- 1...Sd3
- 2.Re2#
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 2.gxf3#
- 1...Sc4
- 2.Qf3#
- 1...Sc6
- 2.Qf3#
- 1...Sg6
- 2.Qf3#
- 1...Sf7
- 2.Qf3#
- 1...Sd4
- 2.Sxg5#
- 2.Bd3#
- 1...Rf8!
- threat
- 1.Qxe6?
- threat
- 2.Qxd5#
- 2.Qf5#
- 2.Qg6#
- 1...Rxd2
- 2.Qxe5#
- 1...Rxg7
- 2.Qxd5#
- 2.Qf5#
- 1...Rxe8
- 2.Qxd5#
- 2.Qf5#
- 1...Rd3
- 2.Qxe5#
- 1...Rd4
- 2.Qxe5#
- 1...Ra5
- 2.Sd6#
- 2.Qc4#
- 2.Qf5#
- 2.Qg6#
- 1...Rb5
- 2.Sd6#
- 2.Qc4#
- 2.Qf5#
- 2.Qg6#
- 1...Rc5
- 2.Sd6#
- 2.Qf5#
- 2.Qg6#
- 1...Rd6
- 2.Sxd6#
- 2.Qf5#
- 2.Qxe5#
- 1...Rf8
- 2.Qxd5#
- 1...dxe6!
- threat
- 1.Bd3+?
- Keys
- 1.Qd6!
- threat
- 2.Qxd5#
- 1...Rxd2
- 2.Qxe5#
- 1...Rxd6
- 2.Sxd6#
- 1...Rd3
- 2.Qxe5#
- 1...Rd4
- 2.Qxe5#
- 1...Ra5
- 2.Re2#
- 1...Rb5
- 2.Re2#
- 1...Rc5
- 2.Re2#
- 1...Sd3
- 2.Re2#
- 1...Sd4
- 2.Bd3#
- 1...Sf4
- 2.Sxg5#
- 1...Sc7
- 2.Qg6#
- threat
- 1.Qd6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 3
- ADDED MATES = 4
- REMOVED MATES = 0
- Sets
- R(b);N_GUARD::S(J)
- R(b);N_GUARD::S(J),XR(b)
- S(c);P_SPINS(e),SBLOCK::R(C)
- S(e);P_SPINS(c),SBLOCK,S_CUTR(b)::B(A)
- S(e);N_GUARD,P_SPINS(c),SBLOCK::S(F),XP(d)
- Tries
- Try
- B(A);CHECK
- Vars
- K(a);P-FLIGHT,P_SPINS(c)::QAR2(H)
- S(c);P_SPINS(e),SBLOCK,XB(A)::R(C)
- Refutation
- R(b);XB(A)
- Try
- Q(H);
- Threat
- DUALS(2)
- Vars
- R(b);OGATE,XR(C)::QAR1(H),XS(c)
- R(b);N_GUARD,XQ(H)::S(J)
- S(c);P_SPINS(e),XP(G)::QAB1(H),XR(b)
- R(b);OGATE::QAR1(H),XS(c)
- S(e);P_SPINS(c),S_CUTR(b)::B(A)
- Refutation
- S(e);P_SPINS(c),XQ(H)
- Try
- Q(H);XP(d)
- Threat
- DUALS(2)
- Vars
- R(b);N_GUARD,XR(C)::QAR1(H),XS(c)
- R(b);N_GUARD::QAR1(H),XS(c)
- R(g);::QAR1(H)
- Refutation
- S(e);P_SPINS(c),XQ(H)
- Try
- Q(H);
- Threat
- QAB1(H)
- Vars
- R(b);N_GUARD,XR(C)::QAR1(H),XS(c)
- S(c);N_GUARD,P_SPINS(e),XP(G)::QAB1(H)
- R(b);N_GUARD::QAR1(H),XS(c)
- S(c);N_GUARD,P_SPINS(e)::QAB1(H)
- Refutation
- R(g);
- Try
- Q(H);P_PINS(c),XS(e)
- Threat
- DUALS(3)
- Vars
- R(b);N_GUARD,XR(C)::QAR1(H),XS(c)
- R(b);N_GUARD::QAR1(H),XS(c)
- R(g);::QAB1(H),XR(b)
- Refutation
- P(f);N_SPINS(c),XQ(H)
- Try
- Actual
- Q(H);
- Threat
- QAB1(H),XR(b)
- Vars
- R(b);N_GUARD,XR(C)::QAR1(H),XS(c)
- R(b);XQ(H)::S(J),XR(b)
- R(b);N_GUARD::QAR1(H),XS(c)
- R(b);::R(C)
- S(c);P_SPINS(e),SBLOCK::R(C)
- S(e);P_SPINS(c),SBLOCK,S_CUTR(b)::B(A)
- S(e);N_GUARD,P_SPINS(c),SBLOCK::S(F),XP(d)
- S(e);OGATE,P_SPINS(c)::QAB(H)
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).