MESON Chess Problem Database
Problem Display
PID: 12027 (B3Q1KB/3ppP2/N1RPk3/qR2P3/2p3Pb/n2P4/b1r2r2/8 w - - 0 1)
Wirtanen, Erkki Aukusti
The Problemist, 1973
#2
12 + 10
SOLUTION
- SOUND
- Sets
- 1...Qe1
- 2.Sc7#
- 1...Qd2
- 2.Sc7#
- 1...Qc3
- 2.Sc7#
- 1...Qb4
- 2.Sc7#
- 1...Qc7
- 2.Sxc7#
- 1...Qa4
- 2.Sc7#
- 1...Qxb5
- 2.Sc7#
- 1...Rd2
- 2.f8S#
- 1...Re2
- 2.f8S#
- 1...Rg2
- 2.f8S#
- 1...Rh2
- 2.f8S#
- 1...Rf6
- 2.Qxe7#
- 1...Rxf7
- 2.Qxf7#
- 1...Bg3
- 2.Qxe7#
- 1...Bf6
- 2.f8S#
- 1...dxc6
- 2.Qc8#
- 1...Qe1
- Tries
- 1.Bf6?
- threat
- 2.Qxe7#
- 2.f8S#
- 1...Qxb5
- 2.Sc7#
- 1...Rxf6
- 2.Qxe7#
- 1...Bxf6
- 2.f8S#
- 1...Qd8
- 2.f8S#
- 1...Sxb5!
- threat
- 1.Rcb6?
- threat
- 2.Sc5#
- 2.Sc7#
- 2.Bd5#
- 1...Qxb6
- 2.Bd5#
- 1...Qxb5
- 2.Sc7#
- 1...Qxa6
- 2.Bd5#
- 1...Sxb5
- 2.Sc5#
- 1...Qb4
- 2.Sc7#
- 2.Bd5#
- 1...Rf6
- 2.Sc7#
- 2.Qxe7#
- 1...Bf6
- 2.Sc7#
- 2.f8S#
- 1...c3
- 2.Sc5#
- 2.Sc7#
- 1...cxd3!
- threat
- 1.Rc7?
- threat
- 2.Sc5#
- 2.Bd5#
- 2.Qxd7#
- 1...Qxc7
- 2.Sxc7#
- 2.Bd5#
- 1...Qxa6
- 2.Bd5#
- 2.Qxd7#
- 1...Sxb5
- 2.Sc5#
- 2.Qxd7#
- 1...cxd3
- 2.Qxd7#
- 1...Qb4
- 2.Bd5#
- 2.Qxd7#
- 1...Qb6
- 2.Bd5#
- 2.Qxd7#
- 1...Rf6
- 2.Qxd7#
- 2.Qxe7#
- 1...Bf6
- 2.Qxd7#
- 2.f8S#
- 1...c3
- 2.Sc5#
- 2.Qxd7#
- 1...Qxb5!
- threat
- 1.Rc8?
- threat
- 2.Sc5#
- 2.Bd5#
- 1...Qxb5
- 2.Sc7#
- 1...Qxa6
- 2.Bd5#
- 1...Sxb5
- 2.Sc5#
- 1...Qb4
- 2.Sc7#
- 2.Bd5#
- 1...Qb6
- 2.Bd5#
- 1...Qc7
- 2.Sxc7#
- 2.Bd5#
- 1...Rf6
- 2.Qxe7#
- 1...Bf6
- 2.f8S#
- 1...c3
- 2.Sc5#
- 1...cxd3!
- threat
- 1.dxe7+?
- 1...d6
- 2.Rxd6#
- 1...dxc6!
- 1...d6
- 1.Bf6?
- Keys
- 1.Rxc4!
- threat
- 2.Sc5#
- 2.Bd5#
- 1...Qxb5
- 2.Sc7#
- 1...Qxa6
- 2.Bd5#
- 1...Rxc4
- 2.Bd5#
- 1...Bxc4
- 2.Sc5#
- 1...Sxb5
- 2.Sc5#
- 1...Qb4
- 2.Sc7#
- 2.Bd5#
- 1...Qb6
- 2.Bd5#
- 1...Qc7
- 2.Sxc7#
- 2.Bd5#
- 1...Rf6
- 2.Qxe7#
- 1...Bf6
- 2.f8S#
- threat
- 1.Rxc4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 13
- Sets
- Q(g);N_GUARD::S(E)
- Q(g);N_GUARD::S(E),XQ(g)
- Q(g);N_GUARD,XR(C)::S(E)
- R(c);N_GUARD::P=S
- R(c);N_GUARD,P_PINP(B)::P=S
- R(c);S_CUTB(f)::QAR1(J),XP(j)
- R(c);OGATE,XP(H)::QAB1(J),XR(c)
- B(f);N_GUARD::QAR1(J),XP(j)
- B(f);S_CUTR(c)::P=S
- P(i);OGATEB,XR(F)::QAB(J)
- Tries
- Try
- B(L);
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD,XR(C)::S(E)
- R(c);XB(L)::QAR1(J),XP(j)
- B(f);XB(L)::P=S
- Q(g);P_PINQ(J)::P=S
- Refutation
- S(d);XR(C)
- Try
- R(F);
- Threat
- DUALS(3)
- Vars
- Q(g);XR(F)::B(I)
- Q(g);XR(C)::S(E)
- Q(g);XS(E)::B(I)
- S(d);XR(C)::S(E)
- Refutation
- P(e);XP(A)
- Try
- R(F);
- Threat
- DUALS(3)
- Vars
- P(e);XP(A)::QAB1(J),XP(i)
- Refutation
- Q(g);XR(C)
- Try
- R(F);
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD,XR(C)::S(E)
- Q(g);XS(E)::B(I)
- S(d);XR(C)::S(E)
- Q(g);::B(I)
- R(c);S_CUTB(f)::QAR1(J),XP(j)
- B(f);S_CUTR(c)::P=S
- P(e);::S(E)
- Refutation
- P(e);XP(A)
- Try
- P(G);CHECK,XP(j)
- Vars
- P(i);P_SPINP(i)::R1(F),XP(i)
- Refutation
- P(i);XR(F)
- Try
- Actual
- R(F);XP(e)
- Threat
- DUALS(2)
- Vars
- Q(g);N_GUARD,XR(C)::S(E)
- Q(g);XS(E)::B(I)
- R(b);XR(F)::B(I)
- B(a);XR(F)::S(E)
- S(d);XR(C)::S(E)
- Q(g);::B(I)
- R(c);S_CUTB(f)::QAR1(J),XP(j)
- B(f);S_CUTR(c)::P=S
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).