{"id":18964,"date":"2020-05-05T21:50:40","date_gmt":"2020-05-05T20:50:40","guid":{"rendered":"http:\/\/www.sachyuo.cz\/?p=18964"},"modified":"2020-05-05T21:53:01","modified_gmt":"2020-05-05T20:53:01","slug":"virove-lekce-zacatecnici-xxix-i-ostatni","status":"publish","type":"post","link":"https:\/\/www.sachyuo.cz\/?p=18964","title":{"rendered":"Virov\u00e9 lekce – za\u010d\u00e1te\u010dn\u00edci XXIX (i ostatn\u00ed?)"},"content":{"rendered":"\n

Hr\u00e1tky s mo\u017enostmi figur<\/strong><\/p>\n

Minul\u00e9 zn\u00e1zor\u0148ov\u00e1n\u00ed mo\u017enost\u00ed jezdce m\u011b inspirovalo k v\u00fdzkum\u016fm, kter\u00e9 jsem zat\u00edm v literatu\u0159e nevid\u011bl (mo\u017en\u00e1 objevuju Ameriku). Zkus\u00edme se pod\u00edvat, kam m\u016f\u017eou r\u016fzn\u00e9 figury druh\u00fdm tahem.

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Jezdce u\u017e jsme m\u011bli v\u010dera. Pozoruhodn\u011b pokr\u00fdv\u00e1 celou \u0161achovnici s v\u00fdjimkou n\u011bkolika „hluch\u00fdch m\u00edst“ (a zd\u00e1 se mi, \u017ee t\u0159et\u00edm tahem u\u017e se dostane na v\u0161echna b\u00edl\u00e1 pole).

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V kout\u011b je na tom o pozn\u00e1n\u00ed h\u016f\u0159.

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St\u0159elec dos\u00e1hne v\u0161ude na pole sv\u00e9 barvy, ale ani za deset tah\u016f se nedostane na barvu opa\u010dnou.

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Jestli stoj\u00ed uprost\u0159ed nebo na kraji, je tu jedno.

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Jakmile mu ale vstoup\u00ed do cesty n\u011bjak\u00e1 p\u0159ek\u00e1\u017eka, bude na tom v\u00fdrazn\u011b h\u016f\u0159 – a to jsem mu tam dal jen voln\u00e9ho p\u011b\u0161ce – kdyby byl blokovan\u00fd, bylo by omezen\u00ed je\u0161t\u011b v\u00fdrazn\u011bj\u0161\u00ed.

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D\u00e1ma a v\u011b\u017e jsou na tom stejn\u011b – na dva tahy se dostanou kamkoliv. A je jedno, jestli stoj\u00ed uprost\u0159ed nebo na kraji.

Kdyby se n\u011bkdo ptal, pro\u010d tedy nen\u00ed v\u011b\u017e stejn\u011b siln\u00e1 jako d\u00e1ma, je to jednak t\u00edm, \u017ee d\u00e1ma m\u016f\u017ee n\u011bkam j\u00edt v\u00edce zp\u016fsoby, jednak p\u0159\u00edmo p\u016fsob\u00ed na v\u00edc pol\u00ed.

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V\u011b\u017e lze zase omezit podobn\u011b jako st\u0159elce.

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Na omezen\u00ed d\u00e1my dv\u011b figury je\u0161t\u011b nesta\u010d\u00ed.

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Kr\u00e1l najednou ukazuje, \u017ee nen\u00ed zas tak pomal\u00e1 figura, jak to vypad\u00e1, jeho ak\u010dn\u00ed radius zab\u00edr\u00e1 docela p\u011bknou \u010d\u00e1st \u0161achovnice. Nen\u00ed divu, \u017ee se v koncovce v\u00fdrazn\u011b uplatn\u00ed.

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A podobn\u011b jako jezdec je i kr\u00e1l slab\u00fd na kraji (slab\u00fd pokud jde o \u00fato\u010dn\u00e9 mo\u017enosti) – tak\u017ee v koncovce rozhodn\u011b centralizovat!

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A i slabou\u010dk\u00fd p\u011b\u0161\u00e1k obs\u00e1hne docela slu\u0161n\u00fd hrozen pol\u00ed (zahrnuju sem mo\u017enosti, kter\u00e9 p\u0159in\u00e1\u0161\u00ed bran\u00ed).

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Kdy\u017e nen\u00ed ve v\u00fdchoz\u00edm postaven\u00ed, m\u00e1 u\u017e mo\u017enost\u00ed m\u00e9n\u011b (proto i z jin\u00fdch d\u016fvod\u016f tahy p\u011b\u0161ci d\u016fkladn\u011b zva\u017eujeme).

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Na kraji je to zase slab\u0161\u00ed. Tady se ukazuje, jak je d\u016fle\u017eit\u00e9 m\u00edt centr\u00e1ln\u00ed p\u011b\u0161ce nebo p\u011b\u0161ce, kte\u0159\u00ed m\u00ed\u0159\u00ed na centrum. (Sosonko p\u00ed\u0161e, jak Gufeld vykl\u00e1dal hodnotu p\u011b\u0161c\u016f: d + e dolar, c + f 90 cent\u016f, b + g 80 cent\u016f, a + h 70 cent\u016f.) To samoz\u0159ejm\u011b neplat\u00ed po\u0159\u00e1d, zvl\u00e1\u0161t\u011b ne, kdy\u017e vzd\u00e1len\u00fd p\u011b\u0161ec ma\u017ee do d\u00e1my.

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A pozor – p\u011b\u0161ec, kter\u00fd m\u00e1 bl\u00edzko do d\u00e1my, svoji hodnotu v\u00fdrazn\u011b zvy\u0161uje, tady m\u00e1 najednou spoustu pol\u00ed (podle toho, v jakou figuru se prom\u011bn\u00ed).

Co na z\u00e1v\u011br? \u0160achy nejsou v\u017edycky takov\u00e1hle matematika, maj\u00ed spoustu v\u00fdjimek. Ale – a to u\u010d\u00edm pokro\u010dil\u00e9 \u00fapln\u011b po\u0159\u00e1d – podstatn\u00e9 je sledovat p\u016fsobnost figur<\/strong>, uva\u017eovat, kde bude kter\u00e1 figurka dob\u0159e st\u00e1t – hned, za dva tahy, nebo i za n\u011bkolik tah\u016f.<\/p>\n","protected":false},"excerpt":{"rendered":"

Hr\u00e1tky s mo\u017enostmi figur Minul\u00e9 zn\u00e1zor\u0148ov\u00e1n\u00ed mo\u017enost\u00ed jezdce m\u011b inspirovalo k v\u00fdzkum\u016fm, kter\u00e9 jsem zat\u00edm v literatu\u0159e nevid\u011bl (mo\u017en\u00e1 objevuju Ameriku). Zkus\u00edme se pod\u00edvat, kam m\u016f\u017eou r\u016fzn\u00e9 figury druh\u00fdm tahem. Jezdce u\u017e jsme m\u011bli v\u010dera. Pozoruhodn\u011b pokr\u00fdv\u00e1 celou \u0161achovnici s v\u00fdjimkou n\u011bkolika „hluch\u00fdch m\u00edst“ (a zd\u00e1 se mi, \u017ee t\u0159et\u00edm tahem u\u017e se dostane na […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[7,12],"tags":[],"class_list":["post-18964","post","type-post","status-publish","format-standard","hentry","category-mladez","category-trenink"],"_links":{"self":[{"href":"https:\/\/www.sachyuo.cz\/index.php?rest_route=\/wp\/v2\/posts\/18964","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sachyuo.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sachyuo.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sachyuo.cz\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sachyuo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=18964"}],"version-history":[{"count":3,"href":"https:\/\/www.sachyuo.cz\/index.php?rest_route=\/wp\/v2\/posts\/18964\/revisions"}],"predecessor-version":[{"id":18982,"href":"https:\/\/www.sachyuo.cz\/index.php?rest_route=\/wp\/v2\/posts\/18964\/revisions\/18982"}],"wp:attachment":[{"href":"https:\/\/www.sachyuo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=18964"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sachyuo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=18964"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sachyuo.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=18964"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}