Cikakkun bayanai game da shiryawa: guda 50/saiti/mai riƙewa, saiti 1/bag
Lokacin Gabatarwa:

Gabatarwa ga ragar ƙwallo

A ƙarshen ƙarni na 19, an yi wasan ƙwallon ƙafa a Ingila. Bayan ƙungiyar masu kai hari ta yi sauri ta yi harbi, 'yan wasan sun yi ihu kuma alkalin wasa ya bayyana cewa ƙwallon ta yi daidai. Amma 'yan wasan da ke kare kansu sun kewaye alkalin wasa suka yi ihu cewa ƙwallon ta tashi daga inda aka zura kwallo kuma bai kamata a ba ta kwallo ba. Shin ƙwallon ta shiga ƙofar? Sai ya zama cewa a wasannin ƙwallon ƙafa a wancan lokacin babu raga a bayan ƙwallon, kuma ana harba ta. Kullum ana yin sauri da sauri, kuma yana da wuya a tantance ko ta shiga raga. Lokacin da 'yan wasan ɓangarorin biyu ke jayayya kuma alkalin wasa bai iya bayyana a sarari ba, wani mai masana'antar kamun kifi mai suna Bao Erji ya gudu zuwa filin wasa. Ya riƙe ragar kamun kifi a hannunsa. Ta wannan hanyar, ƙwallon da aka harba za ta kama a cikin ragar kamun kifi, kuma ba za a sami jayayya kan ko an zura kwallo ko a'a ba. 'Yan wasa da alkalai sun amince da shawararsa, kuma ɓangarorin biyu nan da nan suka rataye ragar kamun kifi suka ci gaba da wasan. Ta wannan hanyar, har ma masu kallo za su iya ganin ko an zura kwallo ko a'a. Wannan hanyar tana magance wata babbar matsala da ke da wahalar tantance ko an ci kwallo ko ba a ci ba a wasannin ƙwallon ƙafa. A shekarar 1891, Hukumar ƙwallon ƙafa ta Ingila ta amince da manufar rataye raga a hukumance, kuma har yanzu ana amfani da ita a yau.