MESON Chess Problem Database
Problem Display
PID: 159613 (K1Q2B2/6nB/p2RP3/r3k2N/3p1N2/b2P1p2/r6n/8 w - - 0 1)
Knott, Hubert Edward
Comm., BCPJ (May), 1919
#2
9 + 9
SOLUTION
- SOUND
- Sets
- 1...Ra4
- 2.Rd5#
- 1...Rd5
- 2.Rxd5#
- 1...Bc5
- 2.Rd5#
- 1...Bxd6
- 2.Bxg7#
- 1...Sf5
- 2.Sg6#
- 1...Sxe6
- 2.Rxe6#
- 2.Qxe6#
- 1...Ra4
- Tries
- 1.Qb7?
- threat
- 2.Qe4#
- 2.Qxg7#
- 1...Sxe6
- 2.Rxe6#
- 2.Qe4#
- 1...Re2
- 2.Qxg7#
- 1...Rg2
- 2.Qe4#
- 1...Rd5
- 2.Rxd5#
- 2.Qxd5#
- 2.Qxg7#
- 1...Sg4
- 2.Qe4#
- 1...Sf5
- 2.Sg6#
- 2.Qe4#
- 1...Se8
- 2.Qe4#
- 1...Sxh5!
- threat
- 1.Qc4?
- threat
- 2.Qxd4#
- 1...Bxd6
- 2.Bxg7#
- 1...Sxe6
- 2.Rxe6#
- 2.Qxe6#
- 1...Ra4
- 2.Rd5#
- 2.Qd5#
- 1...Rd5
- 2.Rxd5#
- 2.Qxd5#
- 1...Bc5
- 2.Rd5#
- 2.Qd5#
- 1...Sf5
- 2.Sg6#
- 1...Bb2!
- threat
- 1.Qc5+?
- 1...Bxc5
- 2.Rd5#
- 1...Rxc5!
- 1...Bxc5
- 1.Qc6?
- threat
- 2.Bxg7#
- 2.Qe4#
- 1...Sxe6
- 2.Rxe6#
- 2.Qe4#
- 1...Rg2
- 2.Qe4#
- 1...Re2
- 2.Bxg7#
- 1...Rd5
- 2.Bxg7#
- 2.Rxd5#
- 2.Qxd5#
- 1...Sg4
- 2.Qe4#
- 1...Sf5
- 2.Sg6#
- 2.Qe4#
- 1...Se8
- 2.Qe4#
- 1...Sxh5!
- threat
- 1.Qc7?
- threat
- 2.Bxg7#
- 2.Rd5#
- 2.Qxg7#
- 1...Bxd6
- 2.Bxd6#
- 2.Bxg7#
- 2.Qxd6#
- 2.Qxg7#
- 1...Sxe6
- 2.Rd5#
- 2.Rxe6#
- 1...Rg2
- 2.Rd5#
- 1...Rd5
- 2.Bxg7#
- 2.Rxd5#
- 2.Qxg7#
- 1...Sg4
- 2.Rd5#
- 1...Sf5
- 2.Sg6#
- 2.Rd5#
- 1...Se8
- 2.Rd5#
- 1...Sxh5!
- threat
- 1.Qb8?
- threat
- 2.Bxg7#
- 2.Rd5#
- 1...Bxd6
- 2.Bxd6#
- 2.Bxg7#
- 2.Qxd6#
- 1...Sxe6
- 2.Rd5#
- 2.Rxe6#
- 1...Rg2
- 2.Rd5#
- 1...Rd5
- 2.Bxg7#
- 2.Rxd5#
- 1...Sg4
- 2.Rd5#
- 1...Sf5
- 2.Sg6#
- 2.Rd5#
- 1...Se8
- 2.Rd5#
- 1...Sxh5!
- threat
- 1.Qd8?
- threat
- 2.Bxg7#
- 2.Qf6#
- 1...Sxh5
- 2.Qg5#
- 1...Sxe6
- 2.Rxe6#
- 2.Qf6#
- 1...Rg2
- 2.Qf6#
- 1...Sf5
- 2.Sg6#
- 2.Qf6#
- 1...Se8
- 2.Qg5#
- 1...Sg4!
- threat
- 1.Qb7?
- Keys
- 1.Qc3!
- threat
- 2.Qxd4#
- 1...Bxd6
- 2.Bxg7#
- 1...Sxe6
- 2.Rxe6#
- 1...dxc3
- 2.d4#
- 1...Ra4
- 2.Rd5#
- 1...Rd5
- 2.Rxd5#
- 1...Bb2
- 2.Qe1#
- 1...Bc5
- 2.Rd5#
- 1...Sf5
- 2.Sg6#
- threat
- 1.Qc3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 0
- Sets
- R(f);N_GUARD::R1(D)
- R(f);N_GUARD::R1(D),XR(f)
- B(c);S_CUTR(f)::R1(D)
- B(c);SBLOCK,XR(D)::B(I),XS(i)
- S(i);SBLOCK::S(B)
- Tries
- Try
- Q(H);
- Threat
- DUALS(2)
- Vars
- R(a);::QAB(H),XS(i)
- R(a);::QAR1(H)
- S(b);::QAR1(H)
- S(i);::QAR1(H)
- Refutation
- S(i);XS(C)
- Try
- Q(H);
- Threat
- QAB1(H),XP(e)
- Vars
- B(c);SBLOCK,XR(D)::B(I),XS(i)
- S(i);SBLOCK::S(B)
- Refutation
- B(c);
- Try
- Q(H);CHECK
- Vars
- B(c);XQ(H)::R1(D)
- Refutation
- R(f);XQ(H)
- Try
- Q(H);
- Threat
- DUALS(2)
- Vars
- R(a);::QAR1(H)
- R(a);::B(I),XS(i)
- S(b);::QAR1(H)
- S(i);::QAR1(H)
- Refutation
- S(i);XS(C)
- Try
- Q(H);
- Threat
- DUALS(3)
- Vars
- R(a);::QAB(H)+R(D),DCHECK
- S(b);::QAB(H)+R(D),DCHECK
- S(i);::QAB(H)+R(D),DCHECK
- Refutation
- S(i);XS(C)
- Try
- Q(H);
- Threat
- DUALS(2)
- Vars
- R(a);::QAB(H)+R(D),DCHECK
- S(b);::QAB(H)+R(D),DCHECK
- S(i);::QAB(H)+R(D),DCHECK
- Refutation
- S(i);XS(C)
- Try
- Q(H);
- Threat
- DUALS(2)
- Vars
- S(i);N_GUARD,XS(C)::QAR2(H)
- R(a);::QAB1(H)
- S(i);N_GUARD::QAR2(H)
- Refutation
- S(b);
- Try
- Actual
- Q(H);P_PINP(e)
- Threat
- QAB1(H),XP(e)
- Vars
- B(c);SBLOCK,XR(D)::B(I),XS(i)
- S(i);OGATE,XP(E)::R1(D),XS(i)
- P(e);N_SPINP(e),OGATE,XQ(H)::P(A)
- R(f);N_GUARD::R1(D)
- R(f);N_GUARD::R1(D),XR(f)
- B(c);S_CUTR(a)::QAR(H)
- B(c);S_CUTR(f)::R1(D)
- S(i);SBLOCK::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).