MESON Chess Problem Database
Problem Display
PID: 92671 (8/5r2/4p2N/4p3/R2qk2p/RQ5K/7B/8 w - - 0 1)
Voormans, F
Tijdschrift vd KNSB, 1957
#2
6 + 6
| 6490 | yacpdb | 2009 |
| 5454 | Near Snap | 2011 |
SOLUTION
- SOUND
- Sets
- 1...Qxa4
- 2.Rxa4#
- 2.Qd3#
- 1...Qb4
- 2.Rxb4#
- 2.Qd3#
- 1...Qc4
- 2.Qxc4#
- 2.Qd3#
- 1...Rf1
- 2.Qb7#
- 1...Rf2
- 2.Qb7#
- 1...Rf3+
- 2.Qxf3#
- 1...Rf4
- 2.Qb7#
- 1...Rf5
- 2.Qb7#
- 1...Rf6
- 2.Qb7#
- 1...Ra7
- 2.Qf3#
- 1...Rb7
- 2.Qf3#
- 2.Qxb7#
- 1...Rc7
- 2.Qf3#
- 1...Rd7
- 2.Qf3#
- 1...Re7
- 2.Qf3#
- 1...Rg7
- 2.Qf3#
- 1...Rh7
- 2.Qf3#
- 1...Rf8
- 2.Qb7#
- 1...Qxa4
- Tries
- 1.Kxh4?
- 1...Qxa4
- 2.Rxa4#
- 2.Qd3#
- 1...Qb4
- 2.Rxb4#
- 2.Qd3#
- 1...Qc4
- 2.Qxc4#
- 2.Qd3#
- 1...Rf1
- 2.Qb7#
- 1...Rf2
- 2.Qb7#
- 1...Rf3
- 2.Qxf3#
- 2.Qb7#
- 1...Rf5
- 2.Qb7#
- 1...Rf6
- 2.Qb7#
- 1...Ra7
- 2.Qf3#
- 1...Rb7
- 2.Qf3#
- 2.Qxb7#
- 1...Rc7
- 2.Qf3#
- 1...Rd7
- 2.Qf3#
- 1...Re7
- 2.Qf3#
- 1...Rg7
- 2.Qf3#
- 1...Rh7
- 2.Qf3#
- 1...Rf8
- 2.Qb7#
- 1...Rf4+!
- 1...Qxa4
- 1.Sf5?
- threat
- 2.Sd6#
- 2.Qf3#
- 1...Qxa4
- 2.Qd3#
- 2.Qf3#
- 1...Rxf5
- 2.Qb7#
- 1...exf5
- 2.Qf3#
- 1...Qc4
- 2.Qd3#
- 2.Qf3#
- 1...Qb4
- 2.Qd3#
- 2.Qf3#
- 1...Rd7
- 2.Qf3#
- 1...Kxf5!
- threat
- 1.Sxf7?
- threat
- 2.Sd6#
- 2.Qf3#
- 1...Qxa4
- 2.Qd3#
- 1...Qb4
- 2.Qd3#
- 1...Qc4
- 2.Qd3#
- 1...Kf5!
- threat
- 1.Bg3?
- 1...Qxa4
- 2.Rxa4#
- 2.Qd3#
- 1...Qb4
- 2.Rxb4#
- 2.Qd3#
- 1...Qc4
- 2.Qxc4#
- 2.Qd3#
- 1...Rf1
- 2.Qb7#
- 1...Rf2
- 2.Qb7#
- 1...Rf3
- 2.Qxf3#
- 2.Qb7#
- 1...Rf4
- 2.Qb7#
- 1...Rf5
- 2.Qb7#
- 1...Rf6
- 2.Qb7#
- 1...Ra7
- 2.Qf3#
- 1...Rb7
- 2.Qf3#
- 2.Qxb7#
- 1...Rc7
- 2.Qf3#
- 1...Rd7
- 2.Qf3#
- 1...Re7
- 2.Qf3#
- 1...Rg7
- 2.Qf3#
- 1...Rh7
- 2.Qf3#
- 1...Rf8
- 2.Qb7#
- 1...hxg3!
- 1...Qxa4
- 1.Rc4?
- 1...Rf3+
- 2.Qxf3#
- 1...Qxc4
- 2.Qxc4#
- 1...Rf1
- 2.Qb7#
- 1...Rf2
- 2.Qb7#
- 1...Rf4
- 2.Qb7#
- 1...Rf5
- 2.Qb7#
- 1...Rf6
- 2.Qb7#
- 1...Ra7
- 2.Qf3#
- 1...Rb7
- 2.Qf3#
- 2.Qxb7#
- 1...Rc7
- 2.Qf3#
- 1...Rd7
- 2.Qf3#
- 1...Re7
- 2.Qf3#
- 1...Rg7
- 2.Qf3#
- 1...Rh7
- 2.Qf3#
- 1...Rf8
- 2.Qb7#
- 1...Kd5!
- 1...Rf3+
- 1.Rxd4+?
- 1...exd4
- 2.Qxe6#
- 1...Kxd4!
- 1...exd4
- 1.Qxe6?
- threat
- 2.Qxe5#
- 2.Qc6#
- 1...Qxa4
- 2.Qxe5#
- 1...Qb4
- 2.Rxb4#
- 2.Qxe5#
- 1...Qc4
- 2.Rxc4#
- 2.Qxc4#
- 2.Qxe5#
- 1...Rf4
- 2.Qc6#
- 1...Rf5
- 2.Qc6#
- 1...Rf6
- 2.Qxe5#
- 1...Rc7
- 2.Qxe5#
- 1...Rd7
- 2.Qxe5#
- 1...Re7
- 2.Qc6#
- 1...Rf3+!
- threat
- 1.Qc3?
- threat
- 2.Qc6#
- 1...Rf3+
- 2.Qxf3#
- 1...Qxa4
- 2.Qxe5#
- 2.Qd3#
- 1...Qb4
- 2.Qxe5#
- 2.Qd3#
- 1...Qc4
- 2.Qxe5#
- 2.Qd3#
- 2.Qxc4#
- 1...Rc7
- 2.Qf3#
- 1...Rd7
- 2.Qf3#
- 1...Kd5!
- threat
- 1.Qb5?
- threat
- 2.Qc6#
- 2.Qxe5#
- 1...Qxa4
- 2.Qd3#
- 2.Qxe5#
- 1...Qb4
- 2.Rxb4#
- 2.Qd3#
- 2.Qxe5#
- 1...Qc4
- 2.Rxc4#
- 2.Qxc4#
- 2.Qxe5#
- 1...Rf4
- 2.Qc6#
- 2.Qb7#
- 1...Rf5
- 2.Qc6#
- 2.Qb7#
- 1...Rc7
- 2.Qxe5#
- 1...Rd7
- 2.Qxe5#
- 1...Rf3+!
- threat
- 1.Kxh4?
- Keys
- 1.Bf4!
- threat
- 2.Qf3#
- 1...Kxf4
- 2.Qe3#
- 1...Qxa4
- 2.Rxa4#
- 1...Rxf4
- 2.Qb7#
- 1...exf4
- 2.Qxe6#
- 1...Qb4
- 2.Rxb4#
- 1...Qc4
- 2.Qxc4#
- threat
- 1.Bf4!
Anticipated by 6756(1933)
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 12
- Sets
- R(f);N_GUARD::QAB(C)
- R(f);CHECK,N_GUARD::QAB1(C),XR(f)
- R(f);N_GUARD::QAB1(C)
- Tries
- Try
- K(D);P-FLIGHT,XP(c)
- Vars
- R(f);N_GUARD::QAB(C)
- R(f);N_GUARD::QAB1(C)
- R(f);N_GUARD,P_PINS(F)::QAB1(C)
- Refutation
- R(f);CHECK
- Try
- S(F);
- Threat
- DUALS(2)
- Vars
- R(f);N_GUARD,SBLOCK,XS(F)::QAB(C)
- P(e);XS(F)::QAB1(C)
- R(f);::QAB1(C)
- Refutation
- K(b);N_SPINQ(a),S_FLIGHT,XS(F)
- Try
- S(F);XR(f)
- Threat
- DUALS(2)
- Vars
- Q(a);N_SPINQ(a),XR(E)::QAB1(C)
- Q(a);::QAB1(C)
- Refutation
- K(b);N_SPINQ(a),S_FLIGHT
- Try
- B(A);
- Vars
- R(f);N_GUARD::QAB(C)
- R(f);N_GUARD::QAB1(C)
- Refutation
- P(c);XB(A)
- Try
- R(E);
- Vars
- R(f);CHECK,N_GUARD::QAB1(C),XR(f)
- Q(a);N_SPINQ(a),OGATE,XR(E)::QAR2(C),XQ(a)
- R(f);N_GUARD::QAB(C)
- R(f);N_GUARD::QAB1(C)
- Refutation
- K(b);N_SPINQ(a),S_FLIGHT
- Try
- R(E);CHECK,XQ(a)
- Vars
- P(d);SBLOCK,XR(E)::QAR2(C),XP(e)
- Refutation
- K(b);P-FLIGHT,XR(E)
- Try
- Q(C);P_PINP(d),XP(e)
- Threat
- DUALS(2)
- Vars
- Q(a);N_SPINQ(a),XR(E)::QAR1(C),XP(d)
- R(f);::QAB(C)
- R(f);::QAR1(C),XP(d)
- Refutation
- R(f);CHECK
- Try
- Q(C);
- Threat
- QAB(C)
- Vars
- R(f);CHECK,N_GUARD::QAB1(C),XR(f)
- R(f);N_GUARD::QAB1(C)
- Refutation
- K(b);N_SPINQ(a),S_FLIGHT
- Try
- Q(C);
- Threat
- DUALS(2)
- Vars
- R(f);::QAR1(C),XP(d)
- Refutation
- R(f);CHECK
- Try
- Actual
- B(A);
- Threat
- QAB1(C)
- Vars
- K(b);P-FLIGHT,XB(A)::QAB1(C)
- Q(a);N_SPINQ(a),OGATE,XR(E)::R(B),XQ(a)
- R(f);N_GUARD,SBLOCK,XB(A)::QAB(C)
- P(d);OGATEB,SBLOCK,XB(A)::QAR2(C),XP(e)
- Q(a);OGATEB::R(E),XQ(a)
- Q(a);OGATEB::QAR2(C),XQ(a)
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).