MESON Chess Problem Database
Problem Display
PID: 279308 (4N3/4pK2/b3PP2/R1n1kN2/Rn4P1/q1p2QP1/5B2/2brr2B w - - 0 1)
Boersma, Kornelis Thomas
Probleemblad, 1955
#2
12 + 10
SOLUTION
- SOUND
- Sets
- 1...Rd2
- 2.Qf4#
- 1...Rd4
- 2.Bxd4#
- 1...Rf1
- 2.Qe4#
- 1...Rg1
- 2.Qe4#
- 1...Re3
- 2.Qf4#
- 1...Re4
- 2.Qxe4#
- 1...Bb2
- 2.Qf4#
- 1...Bd2
- 2.Bd4#
- 1...Be3
- 2.Qe4#
- 1...Bf4
- 2.Qxf4#
- 2.gxf4#
- 1...Be2
- 2.Qe4#
- 1...Bd3
- 2.Bd4#
- 1...Sd3
- 2.Bd4#
- 2.Qd5#
- 1...Rd2
- Tries
- 1.Sd4?
- threat
- 2.Qf5#
- 1...Re3
- 2.Qf4#
- 1...Be3
- 2.Qe4#
- 1...Bf4
- 2.Qxf4#
- 2.gxf4#
- 1...Bd3!
- threat
- 1.Sh4?
- threat
- 2.Sg6#
- 2.Qf5#
- 1...Re3
- 2.Qf4#
- 1...Re4
- 2.Qxe4#
- 2.Qf5#
- 1...Be3
- 2.Qe4#
- 1...Bf4
- 2.Sg6#
- 2.Qxf4#
- 2.gxf4#
- 1...Bd3!
- threat
- 1.Sfd6?
- threat
- 2.Qf5#
- 1...Re3
- 2.Qf4#
- 1...Be3
- 2.Qe4#
- 1...Bf4
- 2.Qxf4#
- 2.gxf4#
- 1...Bd3!
- threat
- 1.Sh6?
- threat
- 2.Qf5#
- 1...Re3
- 2.Qf4#
- 1...Be3
- 2.Qe4#
- 1...Bf4
- 2.Qxf4#
- 2.gxf4#
- 1...Bd3!
- threat
- 1.Sxe7?
- threat
- 2.Sg6#
- 2.Qf5#
- 1...Re3
- 2.Qf4#
- 1...Be3
- 2.Qe4#
- 1...Rd7
- 2.Qf5#
- 1...Re4
- 2.Qxe4#
- 2.Qf5#
- 1...Bf4
- 2.Sg6#
- 2.Qxf4#
- 2.gxf4#
- 1...Bd3!
- threat
- 1.Sfg7?
- threat
- 2.Qf5#
- 1...Re3
- 2.Qf4#
- 1...Be3
- 2.Qe4#
- 1...Bf4
- 2.Qxf4#
- 2.gxf4#
- 1...Bd3!
- threat
- 1.Rxc5+?
- 1...Rd5
- 2.Bd4#
- 1...Sd5!
- 1...Rd5
- 1.Qxc3+?
- 1...Rd4
- 2.Bxd4#
- 2.Qxd4#
- 1...Qxc3!
- 1...Rd4
- 1.Sd4?
- Keys
- 1.Se3!
- threat
- 2.Qe4#
- 2.Qf4#
- 1...Kd4
- 2.Qd5#
- 1...Rxh1
- 2.Qf4#
- 1...Rxe3
- 2.Qf4#
- 1...Bxe3
- 2.Qe4#
- 1...Rd4
- 2.Qf5#
- 1...Rd5
- 2.Qf4#
- 1...Bd3
- 2.Qf4#
- 1...Bb5
- 2.Qf4#
- 1...Bb7
- 2.Sc4#
- 2.Qf4#
- 1...Sd3
- 2.Re4#
- 2.Qe4#
- 2.Qd5#
- 2.Qf5#
- 1...Sd5
- 2.Qf5#
- threat
- 1.Se3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 5
- REMOVED MATES = 7
- Sets
- R(b);S_CUTB(a)::QAB1(C)
- R(b);N_GUARD::B(B),XR(b)
- R(c);N_GUARD::QAR1(C)
- R(c);S_CUTB(a)::QAB1(C)
- R(c);N_GUARD::QAR1(C),XR(c)
- B(a);N_GUARD::QAB1(C)
- B(a);S_CUTR(b)::B(B)
- B(a);S_CUTR(c)::QAR1(C)
- B(i);S_CUTR(c)::QAR1(C)
- B(i);S_CUTR(b)::B(B)
- Tries
- Try
- S(H);
- Threat
- QAR1(C)
- Vars
- R(c);S_CUTB(a)::QAB1(C)
- B(a);S_CUTR(c)::QAR1(C)
- Refutation
- B(i);
- Try
- S(H);
- Threat
- DUALS(2)
- Vars
- R(c);S_CUTB(a)::QAB1(C)
- B(a);S_CUTR(c)::QAR1(C)
- Refutation
- B(i);
- Try
- S(H);
- Threat
- QAR1(C)
- Vars
- R(c);S_CUTB(a)::QAB1(C)
- B(a);S_CUTR(c)::QAR1(C)
- Refutation
- B(i);
- Try
- S(H);
- Threat
- QAR1(C)
- Vars
- R(c);S_CUTB(a)::QAB1(C)
- B(a);S_CUTR(c)::QAR1(C)
- Refutation
- B(i);
- Try
- S(H);XP(j)
- Threat
- DUALS(2)
- Vars
- R(c);S_CUTB(a)::QAB1(C)
- B(a);S_CUTR(c)::QAR1(C)
- R(b);P_PINS(H)::QAR1(C)
- Refutation
- B(i);
- Try
- S(H);
- Threat
- QAR1(C)
- Vars
- R(c);S_CUTB(a)::QAB1(C)
- B(a);S_CUTR(c)::QAR1(C)
- Refutation
- B(i);
- Try
- R(G);CHECK,XS(g)
- Vars
- R(b);P_SPINR(b)::B(B)
- Refutation
- S(f);P_SPINS(f)
- Try
- Q(C);CHECK,XP(e)
- Refutation
- Q(d);XQ(C)
- Try
- Actual
- S(H);
- Threat
- DUALS(2)
- Vars
- K(h);N_SPINS(g),P_SPINS(f),S_CUTR(b),S_FLIGHT::QAR1(C)
- R(c);XB(A)::QAB1(C)
- R(c);XS(H)::QAB1(C)
- B(a);XS(H)::QAR1(C)
- R(b);SBLOCK::QAR1(C)
- R(b);N_SPINS(g)::QAB1(C)
- B(i);::QAB1(C)
- B(i);N_SPINS(g)::QAB1(C)
- S(f);N_SPINS(g)::QAR1(C)
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).