集中連載:「サラブレッドはコースで演技する」第4回
■仕掛け②コースの広さ
「コースの広さ」 コースの広さとは、コースの幅のことである。以下に、中京競馬場を含むG1レースが開催される5場の、芝コースの最大の幅員(最もコースを広く使ったときの幅)を挙げておく。
| 東京競馬場 | 中山競馬場 | 京都競馬場 | 阪神競馬場 | 中京競馬場 |
|---|---|---|---|---|
| 41m | 32m | 35m | 25m | 28m |
コースの幅がレースにどういった影響を与えるかというと、幅が狭くなればなるほど、レースがゴチャつきやすく紛れが多くなり、コースの幅が広ければ広いほど、紛れがそれだけ少なくなる。
コースの幅が狭いと、各馬の間隔も狭くなり、横にいる馬にぶつかられたり、前をカットされたりなど様々なアクシデントに遭遇する可能性が高くなる。また、馬にとっても、幅の狭いコースで走ることはストレスになる。
その反対に、幅の広いコースでは、思わぬ不利を被ることも少なく、各馬のびのびと走ることができるため、持っている能力を発揮しやすい。コースの幅が広ければ広いほど、紛れがそれだけ少なくなるのは当然である。
さらに、コース幅が狭いと、移動柵を大きく使って、芝の養生スペースを取ることができない。たとえば、最大幅員が25mの阪神競馬場の場合(下図参照)、16頭立てのレースに必要な19~20mの幅員を確保するには、わずか5mの養生スペースを取ることしか出来ない。
(阪神競馬場)
そうすると、たとえばCコースからAコースへと替わった時には、内の5mがグリーンベルトで、外の20mが荒れ馬場ということになってしまう。コース幅が広い東京競馬場や京都競馬場であれば、C、DコースからAコースへと替わった場合、芝コース全体が良馬場に替わる。つまり、コース幅が狭いことによって、内を通った馬は伸びて、外を回された馬は失速してしまうというような、トラックバイアスが生まれやすいということになる。そして、トラックバイアスが大きければ、それだけ紛れも多くなることはご存知の通りである。
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Comments
わかりやすくてすばらしいです。
最初のころは、AコースやBコースで、
それぞれ別のコースがあるのかとおもってましたw
Posted by: さとし | July 16, 2006 at 12:19 PM
さとしさん
ありがとうございます。
さとしさんに褒めていただいたの初めてですかねぇ(笑)。
>最初のころは、AコースやBコースで、
>それぞれ別のコースがあるのかとおもってましたw
→確かに。確かに。私もそうだったかもしれません。
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