MESON Chess Problem Database
Problem Display
PID: 214389 (q1B2Q2/2P3pp/1R2P3/R2rkNPp/3p4/2pPbp1N/2K3b1/5nB1 w - - 0 1)
Zappas, Byron
The Problemist, 1987
#2
12 + 12
SOLUTION
- SOUND
- Sets
- 1...Qb8
- 2.cxb8Q#
- 2.cxb8B#
- 1...Bc1
- 2.Bxd4#
- 1...Bd2
- 2.Bxd4#
- 1...Bf4
- 2.Bxd4#
- 1...Bxg5
- 2.Bxd4#
- 1...g6
- 2.Qf6#
- 1...Qb8
- Tries
- 1.Sxe3?
- threat
- 2.Sc4#
- 2.Qd6#
- 2.Qxg7#
- 2.Qf4#
- 2.Qf5#
- 1...Qxa5
- 2.Sc4#
- 2.Qxg7#
- 2.Qf4#
- 2.Qf5#
- 1...Rxa5
- 2.Qd6#
- 2.Qxg7#
- 2.Qf4#
- 2.Qf5#
- 1...Bxh3
- 2.Sc4#
- 2.Qd6#
- 1...dxe3
- 2.Qf4#
- 1...Qc6
- 2.Qf4#
- 1...Qa6
- 2.Rxd5#
- 2.Qd6#
- 2.Qxg7#
- 2.Qf4#
- 2.Qf5#
- 1...Rb5
- 2.Qd6#
- 2.Qxg7#
- 2.Qf4#
- 2.Qf5#
- 1...Rc5
- 2.Qd6#
- 2.Qxg7#
- 2.Qf4#
- 2.Qf5#
- 1...Sd2
- 2.Bh2#
- 2.Qd6#
- 2.Qxg7#
- 2.Qf4#
- 2.Qf5#
- 1...Sg3
- 2.Sc4#
- 2.Qd6#
- 2.Qxg7#
- 2.Qf4#
- 1...g6
- 2.Sc4#
- 2.Qd6#
- 2.Qg7#
- 2.Qf4#
- 2.Qf6#
- 2.Qh8#
- 1...Sxe3+!
- threat
- 1.Sh4?
- threat
- 2.Qd6#
- 2.Qxg7#
- 2.Qf5#
- 1...Qxa5
- 2.Qxg7#
- 2.Qf5#
- 1...Rxa5
- 2.Qd6#
- 2.Qf5#
- 1...Bxh3
- 2.Sxf3#
- 2.Qd6#
- 1...Bxg5
- 2.Qf5#
- 1...Rb5
- 2.Qd6#
- 2.Qf5#
- 1...Rc5
- 2.Qd6#
- 2.Qf5#
- 1...Sg3
- 2.Qd6#
- 2.Qxg7#
- 1...g6
- 2.Qd6#
- 2.Qg7#
- 2.Qf6#
- 2.Qh8#
- 1...Qc6!
- threat
- 1.Sd6?
- threat
- 2.Sc4#
- 2.Qxg7#
- 2.Qf5#
- 1...Qxc8
- 2.Sc4#
- 2.Qf5#
- 1...Rxa5
- 2.Qf5#
- 1...Bxh3
- 2.Sc4#
- 1...Bxg5
- 2.Sc4#
- 2.Qf5#
- 1...Rb5
- 2.Qf5#
- 1...Rc5
- 2.Qf5#
- 1...Qa6
- 2.Qxg7#
- 2.Qf5#
- 1...Sd2
- 2.Qxg7#
- 2.Qf5#
- 1...Sg3
- 2.Sc4#
- 2.Qxg7#
- 1...g6
- 2.Sc4#
- 2.Qg7#
- 2.Qf6#
- 2.Qh8#
- 1...Qc6!
- threat
- 1.Sh6?
- threat
- 2.Qd6#
- 2.Qxg7#
- 2.Qf5#
- 1...Qxa5
- 2.Qxg7#
- 2.Qf5#
- 1...Rxa5
- 2.Qd6#
- 2.Qf5#
- 1...Bxh3
- 2.Qd6#
- 1...Bxg5
- 2.Qf5#
- 1...gxh6
- 2.Qf6#
- 1...Rb5
- 2.Qd6#
- 2.Qf5#
- 1...Rc5
- 2.Qd6#
- 2.Qf5#
- 1...Sg3
- 2.Qd6#
- 2.Qxg7#
- 1...g6
- 2.Qd6#
- 2.Qg7#
- 2.Qf6#
- 2.Qh8#
- 1...Qc6!
- threat
- 1.Se7?
- threat
- 2.Qxg7#
- 2.Qf5#
- 1...Bxg5
- 2.Qf5#
- 1...Qc6
- 2.Sxc6#
- 1...Sg3
- 2.Qxg7#
- 1...g6
- 2.Qg7#
- 2.Qf6#
- 2.Qh8#
- 1...Bxh3!
- threat
- 1.Sxg7?
- threat
- 2.Qd6#
- 2.Qf5#
- 2.Qf6#
- 1...Qxa5
- 2.Qf5#
- 2.Qf6#
- 1...Rxa5
- 2.Qd6#
- 2.Qf5#
- 1...Bxh3
- 2.Qd6#
- 2.Qf6#
- 1...Bxg5
- 2.Qf5#
- 1...Rb5
- 2.Qd6#
- 2.Qf5#
- 1...Rc5
- 2.Qd6#
- 2.Qf5#
- 1...Sg3
- 2.Qd6#
- 2.Qf6#
- 1...Qc6!
- threat
- 1.Rxd5+?
- 1...Kxd5
- 2.Qd6#
- 1...Qxd5!
- 1...Kxd5
- 1.Sxe3?
- Keys
- 1.Sxd4!
- threat
- 2.Qxg7#
- 1...Kxd4
- 2.Qf4#
- 1...Rxa5
- 2.Qd6#
- 1...Bxh3
- 2.Sxf3#
- 1...Bxd4
- 2.Qf4#
- 1...Bxg5
- 2.Qf5#
- 1...Rb5
- 2.Qd6#
- 1...Rc5
- 2.Qd6#
- 1...Qc6
- 2.Sxc6#
- 1...g6
- 2.Qg7#
- 2.Qf6#
- 2.Qh8#
- threat
- 1.Sxd4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 7
- REMOVED MATES = 4
- Sets
- Q(l);OGATE::PXQ(l)=Q
- B(d);OGATE::B(A),XP(f)
- B(d);OGATE,XP(G)::B(A),XP(f)
- P(j);N_GUARD::QAB1(L)
- Tries
- Try
- S(F);XB(d)
- Threat
- DUALS(5)
- Vars
- P(f);XS(F)::QAB1(L)
- Q(l);::QAB1(L)
- Refutation
- S(a);CHECK,XS(F)
- Try
- S(F);
- Threat
- DUALS(3)
- Vars
- B(d);XP(G)::QAR1(L)
- Refutation
- Q(l);
- Try
- S(F);
- Threat
- DUALS(3)
- Vars
- R(g);N_SPINR(g),XR(E)::QAR1(L)
- B(b);XS(D)::S(F)
- R(g);::QAR1(L)
- Refutation
- Q(l);
- Try
- S(F);
- Threat
- DUALS(3)
- Vars
- B(b);XS(D)::QAB1(L)
- B(d);XP(G)::QAR1(L)
- P(j);N_GUARD,XS(F)::QAB1(L)
- Refutation
- Q(l);
- Try
- S(F);
- Threat
- DUALS(2)
- Vars
- B(d);XP(G)::QAR1(L)
- Q(l);N_GUARD::S(F),XQ(l)
- S(a);::QAB(L),XP(j)
- Refutation
- B(b);XS(D)
- Try
- S(F);XP(j)
- Threat
- DUALS(3)
- Vars
- B(d);XP(G)::QAR1(L)
- Refutation
- Q(l);
- Try
- R(E);CHECK,XR(g)
- Vars
- K(h);P-FLIGHT,XR(E)::QAR1(L)
- Refutation
- Q(l);XR(E)
- Try
- Actual
- S(F);XP(f)
- Threat
- QAB(L),XP(j)
- Vars
- K(h);N_SPINR(g),P_SPINB(d),S_FLIGHT,XS(F)::QAR2(L)
- R(g);N_SPINR(g),XR(E)::QAB1(L)
- B(b);N_GUARD,XS(D)::S(F),XP(e)
- B(d);N_GUARD,XS(F)::QAB1(L)
- B(d);XP(G)::QAR1(L)
- R(g);::QAB1(L)
- Q(l);N_GUARD::S(F),XQ(l)
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).