Fuseki (game) (version 8)

    Keywords: Variant

Chinese: 布局棋 (bjq)
Japanese: 布石碁 (fusekigi)
Korean: 포석이 (posŏggi = posuggi)

. Fuseki (game) is my tentative reconstruction of the missing link between [ext] Seega and Go.

Rules

  1. Follow the rules of Go until Black or White would win.
  2. Instead of Black or White winning now, the next player to place a stone may move a stone either one intersection diagonally or up to whatever number Black or White agree orthogonally unless opposing stones have it isolated and in Atari. The Atari rule is less necessary when the stones move closer to like kings.
    1. If Atari is in effect, an isolated stone may only escape to capture.
  3. A player normally captures an opposing stone by sandwiching it between their own diagonally or horizontally and vertically.
    1. The edges of the board are neutral so that a player may not normally capture an opposing stone by sandwiching it between their own and the corner.
    2. As a courtesy, a captured stone should not be removed immediately if the rules and position would allow it itself to capture.
[Diagram]
Atari, Black to move takes at a or b, with squared stone dependent on rules  

.CQOO
.B1..P
.XWX.
..XX.
.....

OTF: Circled stone should not be removed immediately if squared stone may move two intersections  

.BOOQ.BOOQ
..B1.S.B1..S
.XWX..XWX.
..XX...XX.
..........

OTF: Circled stone should not be removed immediately if squared stone may move four intersections  

Special Tactics 1a and 1b : Dango and Empty Triangles

Contrary to Go, dango and empty triangles are not so bad shape in the movement phase of Fuseki due to the de-emphasis of eyes. Dango are always defensive. However, the necessary intermediate step of empty triangles creates linear attacks to the opposite side of the empty triangle.

[Diagram]
Dango and empty triangles example  

..............................
..XOO.......XOO.......XOO.....
...XOO.......XOO.......XOO....
,.X.XOOO..,.X.XOOO..,.X.XOOO..
....XOXXX.....XOXX.....XOXXX.
....XXQQX.....XXQQX.....XQQX.
.....QQQX......QQQX......QQQX.
....aW1Q.......W1QX.......W1QX..
.......X......b..X.......c.X..
..............................

OTF: Dango and empty triangles example


.....c..............
..XOOW1......OOW1d...
...XOO.......XOO....
,.X.XOOO..,.X.XOOO..
....XOXXX.....XOXXX.
....XQQX.....XXQQX.
.....QQQX......QQQX.
......QX........QX..
.......X.........X..
....................

....................
..XOO..e....XOO.....
...XOOW1......OOW1f..
,.X.XOOO..,.X.XOOO..
....OXXX.....XOXXX.
....XXQQX.....XXQQX.
.....QQQX......QQQX.
......QX........QX..
.......X.........X..
....................

OTF: Dango and empty triangles example

Special Tactic 2 : Attacking From Underneath (Undermining)

Inspired by Go, a chain may be attacked from underneath, on the axis where a stone is already above, by moving another stone along this axis towards this stone. This will capture the stone immediately adjacent to the newly occupied intersection along this axis. A chain attacked orthogonally must be sandwiched along the opposite axis for a capture to occur.

[Diagram]
Attack from underneath example  
[Diagram]
Attack from underneath example, B north of black+cross also captured  

....................
..XOO.......XOO.....
...XOO.......XOO....
,.X.XOOO..,.X.XOOO..
....XOXXX.....XOXXX.
....XXQQX.....XXQQX.
.....QQQX......QQPX.
......PX........QXB1.
......B1X.........X.d
......b.............

....................
..XOO.......XOO...g.
...XOO.......XOO.B1..
,.X.XOOO..,.X.XOPO..
....XOXXX.....XOXXX.
....XXQQX.....XXQQX.
.....QPQX......QQQX.
.....B1QX........QX..
....e..X.........X..
....................

OTF: Attack from underneath example


..............................
..XOO.......XOO.......XOO.....
...XOO.......XOO.......XOO....
,.X.XOOO..,..XOOO..,.X.XOOPW1h
....XOXXX..W1..XOXXX.....XOXXX.
....XQQX.f...XXQQX.....XXQQX.
....W1QQQX......QQQX......QQQX.
...c..QX........QX........QX..
.......X.........X.........X..
..............................

OTF: Attack from underneath example

Special Tactic 3: Push Through

  1. Friendly stones may push each other through opposing stones to crush them against the edge or corner of the board or a third friendly stone. In this case, horizontals and verticals only matter when they are the route of attack. Any number of opposing stones may be crushed in this way, but only the one at the far end of the chain is removed.

Note: Two of three possible nominal push throughs to a corner can be called push throughs to an edge without loss of clarity.

[Diagram]

Push through to edge

[Diagram]

Push through to third friendly stone

Special Tactic 4: Wedge


Fuseki (game) (version 8) last edited by 24.89.29.52 on November 24, 2021 - 19:09
RecentChanges · StartingPoints · About
Search · Related · Page info · Latest diff
[Welcome to Sensei's Library!]
RecentChanges
StartingPoints
About
RandomPage
Search position
Page history
Latest page diff
Partner sites:
Go Teaching Ladder
Goproblems.com
Login / Prefs
Tools
Sensei's Library