Connect Four on 6 high, 7 wide grid, there are 4,531,985,219,092 positions for all game boards populated with 0 to 42 pieces. The game was first solved by James Dow Allen (October 1, 1988), and independently by Victor Allis (October 16, 1988). Allis describes a knowledge-based approach, with nine strategies, as a solution for Connect Four. Allen also describes winning strategies in his analysis of the game. At the time of the initial solutions for Connect Four, brute-force analysis was not deemed feasible given the game's complexity and the computer technology available at the time. Connect Four has since been solved with
CT Connect Telephony Services have been discontinued. For CTI servers, important dimensions of interoperation are: Many telephone switch manufacturers have implemented CTI links for their products. Some of these are proprietary protocols and some are implementations of the ECMA CSTA standard. Some of these manufacturers also offer their own CTI servers (such as Nortel's Contact Center Manager Server), but those servers generally operate only with that single manufacturer's telephone system. By contrast, the companies that have owned and marketed CT Connect over the years (see the CT Connect history below) have made arrangements with most major PBX manufacturers to get access to