MESON Chess Problem Database
Problem Display
PID: 250617 (Q1n3b1/Bq1N4/1n2R3/6p1/RNB2kP1/1K3p1P/1P3P2/3r4 w - - 0 1)
Hoek, Willem
Problem (Zagreb), 1952
#2
12 + 8
SOLUTION
- SOUND
- Sets
- 1...Qe4
- 2.Rxe4#
- 2.Qxe4#
- 1...Qa6
- 2.Re4#
- 2.Rf6#
- 2.Qe4#
- 1...Qxa7
- 2.Re4#
- 2.Rf6#
- 2.Qe4#
- 1...Qc7
- 2.Re4#
- 2.Rf6#
- 2.Qe4#
- 1...Qxd7
- 2.Re4#
- 2.Qe4#
- 1...Qb8
- 2.Re4#
- 2.Rf6#
- 2.Qe4#
- 1...Ra1
- 2.Sd3#
- 1...Rb1
- 2.Sd3#
- 1...Rc1
- 2.Sd3#
- 1...Re1
- 2.Sd3#
- 1...Rf1
- 2.Sd3#
- 1...Rg1
- 2.Sd3#
- 1...Rh1
- 2.Sd3#
- 1...Rd3+
- 2.Sxd3#
- 1...Sxa4
- 2.Be3#
- 1...Sxd7
- 2.Be3#
- 1...Sxa8
- 2.Be3#
- 1...Qe4
- Tries
- 1.Bb5?
- threat
- 2.Sd3#
- 2.Sd5#
- 1...Qd5+
- 2.Sxd5#
- 1...Rd3+
- 2.Sxd3#
- 1...Bxe6+
- 2.Sd5#
- 1...Sxa4
- 2.Be3#
- 1...Qe4
- 2.Qxe4#
- 1...Rd4
- 2.Sd3#
- 1...Rd5
- 2.Sd3#
- 2.Sxd5#
- 1...Sd5
- 2.Sd3#
- 2.Sxd5#
- 1...Sc4!
- threat
- 1.Bd5?
- threat
- 2.Sd3#
- 2.Re4#
- 2.Rf6#
- 1...Qxd5+
- 2.Sxd5#
- 1...Rd3+
- 2.Sxd3#
- 1...Qxd7
- 2.Sd3#
- 2.Re4#
- 1...Rxd5
- 2.Sd3#
- 2.Sxd5#
- 1...Bxe6
- 2.Sd3#
- 1...Sxa4
- 2.Be3#
- 2.Re4#
- 2.Rf6#
- 1...Sxd7
- 2.Be3#
- 2.Re4#
- 1...Sxa8
- 2.Be3#
- 2.Re4#
- 2.Rf6#
- 1...Sc4
- 2.Re4#
- 2.Rf6#
- 1...Qc6
- 2.Sd3#
- 2.Re4#
- 1...Re1
- 2.Sd3#
- 2.Rf6#
- 1...Rd4
- 2.Sd3#
- 2.Rf6#
- 1...Bh7
- 2.Sd3#
- 1...Sd6
- 2.Sd3#
- 1...Se7
- 2.Sd3#
- 2.Re4#
- 1...Sxd5!
- threat
- 1.Bb8+?
- 1...Qc7
- 2.Re4#
- 2.Rf6#
- 2.Qe4#
- 1...Qxb8
- 2.Re4#
- 2.Rf6#
- 2.Qe4#
- 1...Rd6
- 2.Sd3#
- 1...Sd6!
- 1...Qc7
- 1.Bb5?
- Keys
- 1.Bd3!
- threat
- 2.Sd5#
- 1...Qd5+
- 2.Sxd5#
- 1...Rxd3+
- 2.Sxd3#
- 1...Sxa4
- 2.Be3#
- 1...Sxd7
- 2.Be3#
- 1...Sxa8
- 2.Be3#
- 1...Qe4
- 2.Qxe4#
- 1...Sc4
- 2.Rf6#
- 1...Sd5
- 2.Re4#
- threat
- 1.Bd3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 7
- Sets
- R(a);N_GUARD::S(F)
- R(a);N_GUARD,P_PINP(A)::S(F)
- R(a);CHECK,N_GUARD::S(F),XR(a)
- S(e);OGATE,P_PINS(F),XR(E)::B(J)
- S(e);OGATE,P_PINS(F),XS(K)::B(J)
- S(e);OGATE,P_PINS(F),XQ(L)::B(J)
- Tries
- Try
- B(G);P_SPINR(I)
- Threat
- DUALS(2)
- Vars
- Q(f);CHECK,N_PINR(I)::R(E)+S(F),DCHECK,XQ(f)
- R(a);CHECK::R(E)+S(F),DCHECK,XR(a)
- B(h);CHECK,XR(I)::R(E)+S(F),DCHECK
- S(e);OGATE,XR(E)::B(J)
- Q(f);OGATE::QAR1(L),XQ(f)
- R(a);::S(F)
- Refutation
- S(e);N_PINR(I)
- Try
- B(G);
- Threat
- DUALS(3)
- Vars
- Q(f);CHECK,XB(G)::R(E)+S(F),DCHECK,XQ(f)
- R(a);CHECK::R(E)+S(F),DCHECK,XR(a)
- B(h);P_PINB(G),XR(I)::R(E)+S(F),DCHECK
- B(h);::R(E)+S(F),DCHECK
- S(g);::R(E)+S(F),DCHECK
- Refutation
- S(e);P_PINS(F),XB(G)
- Try
- B(J);CHECK
- Vars
- R(a);P_SPINR(a)::S(F)
- Refutation
- S(g);P_SPINS(g)
- Try
- Actual
- B(G);P_SPINR(I)
- Threat
- R(E)+S(F),DCHECK
- Vars
- Q(f);CHECK,N_PINR(I)::R(E)+S(F),DCHECK,XQ(f)
- R(a);CHECK,XB(G)::R(E)+S(F),DCHECK,XR(a)
- S(e);OGATE,P_PINS(F),XR(E)::B(J)
- S(e);OGATE,P_PINS(F),XS(K)::B(J)
- S(e);OGATE,P_PINS(F),XQ(L)::B(J)
- Q(f);OGATE::QAR1(L),XQ(f)
- S(e);N_PINR(I),P_PINS(F)::R(I)
- S(e);N_PINR(I),P_PINS(F)::R1(I)
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).