I was told (a long time ago) that our Hakka family Style of Longfist may well have a 'Chaquan' component within it. Certainly, the movements contained in the clip below are similar - or identical in application - but I think our Longfist is older than the arrival of Arabs in China and it is more likely that these Merchants 'borrowed' from our Style rather than the other way around. It is a matter of working-out the logical 'chain of evidence':
This is a Norhern Style historically associated with the 'Hui' Muslims living in China - the descendants of Arab (Turkic) Merchants who stayed in China and married Chinese women around a thousand years ago. I suspect these men (and their descendants) constructed this Style using common Longfist techniques. This variant is termed 'Yanzhou' - which I assume is a geographical location in Shandong. The name may mean 'Investigate' or 'Learned Fist' (perhaps in the context of 'Knowledgeable Boxing') - depending upon how '查' (cha2) is pronounced. When written as '楂' (cha2) - it refers to a 'wooden raft' - perhaps used in 'travelling' and 'trading'! Finally, although I have no evidence of this myself, I was told that 'Cha' might be a Chinese language transliteration of the (Turkic-Mongolian) term 'Khan'.
It turns out that the Wing Chun KO I forwarded earlier occured around 17.7.2020 in Guangzhou:
I was a little confused as to who was doing the knocking-out (I still do not know their names or 'why' the fight took place) - as the termed used is '拳击爱好' (Quan Ji Ai Hao) - literally 'Fist-Striking Love Admire' or more succinctly - 'Fist-Hitting Enthusiasts' - which turns-out to be how Mainland Chinese people refer to Chinese practitioners of Western Boxing! As this is not my area of expertise within Chinese culture (I only discuss Boxing in English) - I was not used to seeing it! There is a movement within modern China that views Western Boxing as pragmatic and vastly superior to indigenous Chinese martial arts (which are interpreted to be ineffective and steeped in useless and pointless superstition).
This attitude probably began with the British cannons and muskets of the First Opium War (1839) and was confirmed in the massive casualties inflicted upon the Imperial Chinese military forces by the modern armies of Japan, Russia and the West during the so-called 'Boxer Uprising' (1898-1901)! Invincible qigong (dao-yin) turned-out not to be that 'invincible' after-all - when (Chinese) human bodies were struck by cannon-balls, grape-shot and musket balls! Those who managed to close the 'distance' between competing armies (surviving the incoming fire) were usually so psychologically and physically debilitated that they were useless as a fighter upon reaching enemy lines - being easily killed.
I have also read Chinese language descriptions of accomplished Chinese martial artists coming unstuck when confronted by well-trained (but quite 'ordinary') British Infantrymen fighting with bayonets (and no ammunition)! These tough working-class men just 'stood their ground' and kept to their basic training (lunge, penetrate, twist and withdraw)!
Apparently, this British ability so impressed the Allied Japanese at the time that a special 'Bayonet Art' was established in the Imperial Japanese Army and may well have been the motivating force behind what would become known as the 'Banzai' charge famous throughout the Pacific War (1941-1945)! Although the Japanese would later give some flannel about 'Sanurai' charges and the like! I gather that the mass produced Samurai Swords of WWII often harmlessly bounced-off opponents - or snapped the first time they were used to strike!
Interestingly, all the way through the above clip, the taller (Wing Chun) man is repeatedly landing 'training slaps' to the face of the shorter 'Boxer' - demonstrating where his opponent is 'open' in defence! This approach works in a disciplined training hall - where the point is collective self-improvement - but obviously NOT in a situation like this where the 'Boxers' are attempting to prove a point regarding effectiveness. If the Wing Chun practitioner had landed full-powered shots instead of slaps - the outcome might have been different.
Shifu Adrian Chan-Wyles (b. 1967) - Lineage (Generational) Inheritor of the Ch'an Dao Hakka Gongfu System.