MESON Chess Problem Database
Problem Display
PID: 27931 (B3b2r/b2r4/K1Q5/1p2N2p/N2kpPP1/1PpP3R/2pqPnn1/2B5 w - - 0 1)
Foster, Geoffrey R
4th Prize, The Problemist, 2001
#2
12 + 13
| 4258 | Brian Harley Award | 2001-2002 |
| 6329 | Australian Chess | 2003 |
| 56 | The Problemist | 2003 |
| 56 | The Problemist | 2006 |
SOLUTION
- SOUND
- Sets
- 1...Qxc1
- 2.Qxc3#
- 1...Qe3
- 2.Qxc3#
- 1...Qxf4
- 2.Qxc3#
- 1...Qd1
- 2.Qxc3#
- 1...Qxe2
- 2.Qxc3#
- 1...Rd5
- 2.Qxd5#
- 1...Rd6
- 2.Qxd6#
- 1...Rb7
- 2.Qd6#
- 1...Rc7
- 2.Qd5#
- 2.Qd6#
- 1...Re7
- 2.Qd5#
- 2.Qd6#
- 1...Rf7
- 2.Qd5#
- 2.Qd6#
- 1...Rg7
- 2.Qd5#
- 2.Qd6#
- 1...Rdh7
- 2.Qd5#
- 2.Qd6#
- 1...Bc5
- 2.Qxc5#
- 1...Bb6
- 2.Qxb6#
- 1...Bb8
- 2.Qc5#
- 2.Qb6#
- 1...Bg6
- 2.Qxd7#
- 1...Sd1
- 2.Qxe4#
- 1...Sh1
- 2.Qxe4#
- 1...Sxd3
- 2.Qxe4#
- 1...Sxh3
- 2.Qxe4#
- 1...Sxg4
- 2.Qxe4#
- 1...e3
- 2.Sf3#
- 1...bxa4
- 2.Qc4#
- 1...b4
- 2.Qc4#
- 1...Qxc1
- Tries
- 1.Sg6?
- threat
- 2.Qf6#
- 1...Qxf4
- 2.Qxc3#
- 1...Sxd3
- 2.Qxe4#
- 1...Sxh3
- 2.Qxe4#
- 1...Sxg4
- 2.Qxe4#
- 1...bxa4
- 2.Qc4#
- 1...Rd5
- 2.Qxd5#
- 1...Rd6
- 2.Qxd6#
- 1...Rb7
- 2.Qd6#
- 1...Re7
- 2.Qd5#
- 2.Qd6#
- 1...Rf7
- 2.Qd5#
- 2.Qd6#
- 1...Bb8
- 2.Qc5#
- 2.Qb6#
- 1...Rf8!
- threat
- 1.Sxd7?
- threat
- 2.Qd5#
- 2.Qd6#
- 2.Qf6#
- 1...Qxf4
- 2.Qd5#
- 2.Qxc3#
- 1...Sxd3
- 2.Qxe4#
- 2.Qd5#
- 2.Qd6#
- 1...Sxh3
- 2.Qxe4#
- 1...Sxg4
- 2.Qxe4#
- 2.Qd5#
- 2.Qd6#
- 1...Sxf4
- 2.Qf6#
- 1...Rf8
- 2.Qd5#
- 2.Qd6#
- 1...Bc5
- 2.Qd5#
- 2.Qxc5#
- 2.Qf6#
- 1...Bb8
- 2.Qd5#
- 2.Qc5#
- 2.Qb6#
- 1...Bf7
- 2.Qf6#
- 1...Se3
- 2.Qf6#
- 1...Rh6!
- threat
- 1.Sf7?
- threat
- 2.Qf6#
- 1...Qxf4
- 2.Qxc3#
- 1...Rxf7
- 2.Qd5#
- 2.Qd6#
- 1...Sxd3
- 2.Qxe4#
- 1...Sxh3
- 2.Qxe4#
- 1...Sxg4
- 2.Qxe4#
- 1...bxa4
- 2.Qc4#
- 1...Rd5
- 2.Qxd5#
- 1...Rd6
- 2.Qxd6#
- 1...Rb7
- 2.Qd6#
- 1...Re7
- 2.Qd5#
- 2.Qd6#
- 1...Bb8
- 2.Qc5#
- 2.Qb6#
- 1...Rh6!
- threat
- 1.e3+?
- 1...Qxe3
- 2.Qxc3#
- 1...Sxe3!
- 1...Qxe3
- 1.Sg6?
- Keys
- 1.Qf6!
- threat
- 2.Sc4#
- 2.Sg6#
- 2.Sxd7#
- 2.Sf7#
- 1...Rd6+
- 2.Qxd6#
- 1...Qxf4
- 2.Sf3#
- 1...Sxd3
- 2.Sxd3#
- 1...Sxh3
- 2.Sc4#
- 1...Sxg4
- 2.Sxg4#
- 1...bxa4
- 2.Sxd7#
- 1...Rb7
- 2.Qd6#
- 1...Rh6
- 2.Sg6#
- 1...Rd5
- 2.Sc6#
- 1...Rc7
- 2.Sc4#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 2.Qd6#
- 1...Re7
- 2.Qd6#
- 1...Rf7
- 2.Sxf7#
- 2.Qd6#
- 1...Rg7
- 2.Sc4#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 2.Qd6#
- 1...Rdh7
- 2.Sc4#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 2.Qd6#
- 1...Rd8
- 2.Sc4#
- 2.Sg6#
- 2.Sd7#
- 2.Sf7#
- 1...Rf8
- 2.Sf7#
- 1...Bb8
- 2.Qb6#
- 1...Bg6
- 2.Sc4#
- 2.Sxg6#
- 2.Sxd7#
- 2.Sf7#
- 1...Bf7
- 2.Sc4#
- 2.Sg6#
- 2.Sxd7#
- 2.Sxf7#
- threat
- 1.Qf6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 6
- ADDED MATES = 4
- REMOVED MATES = 11
- Sets
- Q(b);N_GUARD,XB(A)::QAB1(K),XP(e)
- Q(b);N_GUARD::QAB1(K),XP(e)
- Q(b);N_GUARD,XP(G)::QAB1(K),XP(e)
- Q(b);N_GUARD,XP(B)::QAB1(K),XP(e)
- R(k);N_GUARD::QAR1(K),XR(k)
- R(k);N_GUARD,P_PINQ(K)::QAR2(K),XR(k)
- R(k);N_GUARD::QAR2(K)
- B(j);N_GUARD::QAB1(K),XB(j)
- B(j);N_GUARD::QAB(K),XB(j)
- B(l);N_GUARD::QAR(K),XR(k)
- S(c);N_GUARD::QAR1(K),XP(g)
- S(c);N_GUARD,XP(D)::QAR1(K),XP(g)
- S(c);N_GUARD,XR(E)::QAR1(K),XP(g)
- S(c);N_GUARD,XP(H)::QAR1(K),XP(g)
- P(g);N_GUARD,SBLOCK::S(I)
- P(h);N_GUARD,XS(F)::QAR1(K)
- P(h);N_GUARD::QAR1(K)
- Tries
- Try
- S(I);
- Threat
- QAB(K)
- Vars
- Q(b);N_GUARD,XP(G)::QAB1(K),XP(e)
- S(c);N_GUARD,XP(D)::QAR1(K),XP(g)
- S(c);N_GUARD,XR(E)::QAR1(K),XP(g)
- S(c);N_GUARD,XP(H)::QAR1(K),XP(g)
- P(h);N_GUARD,XS(F)::QAR1(K)
- R(k);N_GUARD::QAR1(K),XR(k)
- R(k);N_GUARD,P_PINQ(K)::QAR2(K),XR(k)
- R(k);N_GUARD::QAR2(K)
- Refutation
- R(m);
- Try
- S(I);XR(k)
- Threat
- DUALS(3)
- Vars
- S(c);N_GUARD,XR(E)::QAR1(K),XP(g)
- S(d);XP(G)::QAB(K)
- B(l);::QAB(K)
- S(d);::QAB(K)
- Refutation
- R(m);P_PINQ(K)
- Try
- S(I);
- Threat
- QAB(K)
- Vars
- Q(b);N_GUARD,XP(G)::QAB1(K),XP(e)
- S(c);N_GUARD,XP(D)::QAR1(K),XP(g)
- S(c);N_GUARD,XR(E)::QAR1(K),XP(g)
- S(c);N_GUARD,XP(H)::QAR1(K),XP(g)
- P(h);N_GUARD,XS(F)::QAR1(K)
- R(k);N_GUARD::QAR1(K),XR(k)
- R(k);N_GUARD,P_PINQ(K)::QAR2(K),XR(k)
- R(k);N_GUARD::QAR2(K)
- Refutation
- R(m);P_PINQ(K)
- Try
- P(B);CHECK
- Vars
- Q(b);XP(B)::QAB1(K),XP(e)
- Refutation
- S(d);XP(B)
- Try
- Actual
- Q(K);
- Threat
- DUALS(4)
- Vars
- R(k);CHECK,N_GUARD::QAR2(K),XR(k)
- Q(b);XP(G)::QAB(K)+S(I),DCHECK
- S(c);XP(D)::QAB(K)+S(I),XS(c)
- S(c);XR(E)::QAB(K)+S(I)
- S(c);XP(H)::QAB(K)+S(I),XS(c)
- P(h);XS(F)::QAB(K)+S(I),XR(k)
- R(k);N_GUARD::QAR2(K)
- R(m);P_PINQ(K)::QAB(K)+S(I)
- R(k);SBLOCK::QAB(K)+S(I),DCHECK
- R(m);::QAB(K)+S(I)
- B(j);N_GUARD::QAB(K)
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).