Go is impossible under its current rule, because Black surely wins, playing the first move at Tengen. It's no longer a question of Komi, because he wins very well.

For the ancient Chinese as well as for the Japanese professionals, the center remained Terra Incognita (until today).

Having an itch to start a series of local fights, the Chinese put five stones to the Hoshi beforehand: psychic rather than geographical "milestones". Indeed, the Tengen had no strategic effect.

5 Chinese stones placed at the Hoshi.
Black starts.

As for the Japanese, they were logical in their own way; the Hoshi in a corner is too vague to defend it, the san-san is too low, they preferred the Komoku or the Takamoku, then the Shimari or the Kakari, then the extension towards the edge as in a bancroche march; that is, the order of play of stones is corner -> edge -> center.

The center is always dark as on the clouds. It is necessary to clarify the characteristics of Tengen. First of all, we will examine the continuation of move 2 in Hoshi of corner or on the edge.

After Black's Tengen 1, White has only two choices: a corner or edge move; it is absolutely necessary to confirm and reaffirm it. Otherwise, we will always have illusions elsewhere. Overall, this means that the possibilities of complications are drastically reduced. Back to the diagram.

If Black plays 3, White plays A or B or C. D, E and F are no longer a problem.

After 15 White must choose A or B.

If White plays A (35 points), Black B. White cannot play the tsuke at C to make sabaki (see Slide 1).

To make the balanced game, 6 and 8 are needed, but 9-11-13 is a good set for Black. The game is always exhausting for White.

4 and 5 are equivalent. If White plays 6 in 14, Black in 6.
For Black, it will be good to play 9, because if White follows the sequence 9-10-11-12-13-14, Black will play 15. Then, White is in dilemma because that playing 10 to 15 is an intolerable humiliation.

6, 8, 10, 12 are required. Clearly, Black is advancing.

White can't do anything.

The 2-4-6-8 formation is energetic, but precarious. Invasion 9 is severe. White's counter-attack at 18 turns out to be abusive.

This way of playing is moderate, but no hope for White.

Anyone who realizes the power of Tengen will feel that go is less complex than one imagines. The Tengen suppresses san-san, Shimari, Keima-Kakari in Hoshi and almost all of the giant joseki, in addition Black always takes the initiatives.

All stone movements work around the Tengen. If traditional go is fencing, this new type is long spear jousting on horseback. We'll call him "Ivanhoe"!