Sit and Go is a type of tournament. There is a pre-selected amount of players, when enough people have registered, the tournament begins. Most often, a sit and go tournament is a single-table tournament or a multi table tournament. Sit and go tournaments are very popular online because it is a good and profitable at low risk as multi tabling allowed you to increase the hourly earning.
SNG Strategy - There are many way to approach this type of tournaments with different strategies and style. Most depend from the type of table (Tight or Loose) and from the type of players. 
Tools - Spreadsheet for the SNGs. Many poker's players are using Sharkscope to have an indea on their own results, like, R.O.I., % of ICM, etc. For SNG microstakes grinders, Sharkscope may be a bit expansive. So, with this excel spreadsheet file is the perfect solution. Insert your final positions and you will have all the some information that you can have with sharkscope. Enter here.
Free SnG Hand Analyzer: Nash Calculator. Nash Equilibrium Push/Fold ranges for NLHE SnG hands. Also, Headsup Push/Fold Nash Equilibrium strategies. Enter here.
ICM Explorer - ICM Explorer can import hand histories from PokerStars and Full Tilt Poker, reading the blinds and antes. ICM Explorer helps you to study situations away from the table, so that you can act quickly, confidently, and correctly when you do play. Enter here.
Kiroman talking about his Sit and Gos tournaments experiences in the blog here.
Kiroman play Sit an Gos at: Pokerstars, Party Poker, PKR, Pacific Poker, Full Tilt.
SNG Multi Table (18 - 45 - 90 - 180 - 360 players ). Enter here.
SNG Double or Nothing (10 players). Enter here.
SNG Single Table (9 - 10 players). Enter here.
Multi-Tabling
Pokerstars is the ideal for multi-tabling the Sit and Go tournaments as Pokerstars has a large quantity of traffic. Enter Pokerstars here.
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