Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Res. | Record | Opponent | Method | Event | Round | Time | Location |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Loss | 13–16–3 (1) | Ivan Serati | Submission (Rear Naked Choke) | Cage Rage 24: Feel the Pain | 2.0 | 1:34 | London, England |
| Loss | 13–15–3 (1) | Mario Sperry | Submission (Rear Naked Choke) | Cage Rage 22: Hard as Hell | 1.0 | 1:39 | London, England |
| Win | 13–14–3 (1) | Hiroyuki Ito | KO (Strikes) | Pain and Glory 2004 | 1.0 | 0:32 | Birmingham , England |
| Loss | 12–14–3 (1) | Fedor Emelianenko | Submission (Guillotine Choke) | Rings: World Title Series 5 | 1.0 | 4:10 | Kanagawa , Japan |
| Win | 12–13–3 (1) | Georgi Tonkov | KO (Flying Knee) | Rings: World Title Series 4 | 1.0 | 4:22 | Tokyo, Japan |
| NC | 11–13–3 (1) | Sander Thonhauser | No contest | Rings Holland: Heroes Live Forever | 1.0 | N/A | Utrecht, Netherlands |
| Loss | 11–13–3 | Volk Han | TKO (Eye Injury) | Rings: King of Kings 2000 Block B | 2.0 | 0:08 | Osaka, Japan |
| Loss | 11–12–3 | Joop Kasteel | TKO (Shoulder Injury) | Rings Holland: Di Capo Di Tutti Capi | 1.0 | 1:18 | Utrecht, Netherlands |
| Loss | 11–11–3 | Mikhail Illoukhine | Decision (Split) | Rings Russia: Russia vs. The World | 3.0 | 5:00 | Ekaterinburg , Russia |
| Loss | 11–10–3 | Mikhail Avetisyan | Submission (Strikes) | IAFC – Pankration World Championship 2000 (Day 2) | 1.0 | N/A | Moscow, Russia |
| Loss | 11–9–3 | Renato Sobral | Decision (Unanimous) | RINGS: King of Kings 1999 Block A | 2.0 | 5:00 | Tokyo, Japan |
| Win | 11–8–3 | Achmed Labasanov | TKO (Kick) | RINGS: King of Kings 1999 Block A | 2.0 | 3:33 | Tokyo, Japan |
| Win | 10–8–3 | Dave van der Veen | Submission (Armbar) | Total Fight KRG 5 | 1.0 | 1:47 | Milton Keynes, England |
| Draw | 9–8–3 | Satoshi Honma | Draw | RINGS: Battle Genesis Vol. 5 | 1.0 | 20:00 | Tokyo, Japan |
| Win | 9–8–2 | Ricardo Fyeet | Submission ( Toe Hold ) | RINGS: Rise 5th | 1.0 | 15:01 | Yokohama, Japan |
| Win | 8–8–2 | Ryuki Ueyama | Disqualification ( Eye-gouging ) | RINGS: Rise 2nd | 1.0 | 4:18 | Osaka, Japan |
| Win | 7–8–2 | Yasuhito Namekawa | KO (Knee) | Night of the Samurai 3 | 1.0 | 5:55 | Milton Keynes, England |
| Loss | 6–8–2 | Yasuhito Namekawa | Decision | RINGS: Mega battle Tournament 1998 | 1.0 | 20:00 | Tokyo, Japan |
| Draw | 6–7–2 | Yasuhito Namekawa | Draw | RINGS: Mega battle Tournament 1998 | 1.0 | 20:00 | Osaka , Japan |
| Loss | 6–7–1 | Gilbert Yvel | TKO (Cut) | RINGS Holland-The Thialf Explosion | 1.0 | N/A | Heerenveen , Netherlands |
| Loss | 6–6–1 | Hiromitsu Kanehara | Decision | Night of the Samurai 2 | 1.0 | 15:00 | Milton Keynes, England |
| Win | 6–5–1 | Kenichi Yamamoto | KO (Palm Strikes & Knee) | RINGS: Fighting Integration 6th | 1.0 | 10:56 | Yokohama , Japan |
| Win | 5–5–1 | Dave van der Veen | KO (Palm Strikes) | RINGS Holland-Who's The Boss | 2.0 | 4:47 | Utrecht , Netherlands |
| Loss | 4–5–1 | Hiromitsu Kanehara | Decision | RINGS: Fighting Integration 3rd | 1.0 | 30:00 | Sapporo , Japan |
| Win | 4–4–1 | Sander Thonhauser | Submission ( Armbar ) | Night of the Samurai 1 | 1.0 | 0:55 | Milton Keynes, England |
| Loss | 3–4–1 | Joop Kasteel | Submission ( Headlock ) | RINGS: Mega Battle Tournament 1997 | 1.0 | 8:55 | Tokyo, Japan |
| Win | 3–3–1 | Peter Dijkman | Submission ( Rear Naked Choke ) | Total Fight Night | 1.0 | 4:46 | Milton Keynes, England |
| Loss | 2–3–1 | Masayuki Naruse | Submission ( Shoulder Necklock ) | RINGS: Fighting Extension Vol. 4 | 1.0 | 12:58 | Tokyo, Japan |
| Win | 2–2–1 | Sean McCully | Submission (Guillotine Choke) | RINGS: Battle Genesis Vol. 1 | 1.0 | 3:59 | Tokyo, Japan |
| Loss | 1–2–1 | Hans Nijman | Submission ( Guillotine Choke ) | RINGS Holland-The Final Challenge | 2.0 | 0:51 | Amsterdam, Netherlands |
| Loss | 1–1–1 | Cees Bezems | TKO (Cut) | IMA – Battle of Styles | 1.0 | N/A | Amsterdam, Netherlands |
| Draw | 1–0–1 | Andre Mannaart | Draw | RINGS Holland-Kings of Martial Arts | 2.0 | 5:00 | Amsterdam , Netherlands |
| Win | 1–0–0 | Boston Jones | TKO (Cut) | Fighting Arts Gala | 2.0 | 2:30 | Milton Keynes , England |
Question:
What was the method for opponent of Ivan Serati?
Answer:
Submission (Rear Naked Choke)