Examples for Bedrich Formánek 70 JT - 3

1.Sc1! th. 2.Sd3#
1...Gd4 2.Qe2#
1...d4 2.Qxb5#
1...Sbd4 2.Qb8#
1...Sfd4 2.Qxh2#

Rich and interesting strategy. All black moves defend by unpin of bR (pinned by wQ), but the error is just opposite - after departue of wQ rook appears pinned by wG. The idea is even deeper. Any black move to d4 defends and also allows other mate Qe2#. But black can precise the play by moving specific pieces to d4 - 2x knight and 1x pawn. They defend also the secondary mate Qe2# - it is arrival correction. All this moves have the same (or strictly said similar) second error as well - they all open white line, allowinf other wQ mates.

1.Be4! th. 2.Ee6#
1...Sxe4 2.Ed5#
1...Kxd6 2.Qd5#

Three model mates make use of Sc7 pin.

1...Kc2 2.Qb3#
1...Kxe4 2.Qd5#
1...Kxe2 2.Qf1#

1.Qf1! zz
1...Kc2 2.GNd5#
1...Kxe4 2.GNb3#
1...Kc4 2.GNf5#

Three queen mates are after give-and-take key changed to three gnu mates from gnu-queen battery.

1.Nd5? zz
1...S~ 2.Nb1#
1...Sxf2! 2.Nc7#
1...Sxg3! 2.Nb6#
1...Sc3! 2.Nxc3#
1...Sg5!

1.Nc6! zz
1...S~ 2.Ne5#
1...Sxf2! 2.Na5#
1...Sxg3! 2.Nd8#

In both try and solution any bS move allows double-check mate. Black thus tries to provide flights to own king by captures of guarding pawns, but this corrections selfpin bS and allow mates reguarding new flights.

1.Sc~? th. 2.Qc3#
1...Ne5!

1.Se4? th. 2.Qc3#
1...Ne5 2.Sd6#
1...Re5!

1.Scd5? th. 2.Qc3#
1...Ne5 2.Ne8#
1...Be5!

1.Sca2! th. 2.Qc3#
1...Ne5 2.Ne8#
1...Re5 2.Bxd3#
1...Be5 2.Qe6#

This problem shows correction on the other side - white correction. Any move of wSc3 threats Qd4#, but Black can defend by moves to e5, making threat move impossible by gate closing. That's why White must provide mate for 1...Ne5 and then he must take care not to remove mates provided for 1...Re5 and 1...Be5. Nice example of cyclic Grimshaw.

1.Ne8? th. 2.Nb2#
1...Sf3 2.Sxg6#
1...c4 2.Qe3#
1...Bxe8 2.Se6#
1...Bc3 2.hxg3#
1...Se5!

1.Nd2! th. 2.Nb6#
1...Sf3 2.Qxf3#
1...c4 2.Be3#
1...Be6 2.Sxe6#
1...Bxd2 2.hxg3#

Changed mates. Defences 1...c4 and 1...Sf3 have the same defence motive in both phases despite different threats: 1...c4 closes gate for mating nightrider, 1...Sf3 closes line e2-g4, unguarding actually or in anticipation g4.