🌄 Borderlands
Borderlands is a chess variant created by dpldgr in 2025 for PyChess' Variant Design Contest.
General Rules
- White has the first move.
- All pieces are capturable and are permanently removed from play upon capture.
- As Chiefs are capturable, checkmate and stalemate don't exist in Borderlands.
- Pieces promote immediately upon reaching their Promotion Zone/Square.
- Warriors starting on the 3rd rank may make a double step on their first move, and may be captured en passant on the enemy's next move.
Win Conditions
- Win by Surrender: Capture both enemy Chiefs and the enemy immediately surrenders.
- Win by Conquest: Occupy all four Village Squares for two consecutive moves (one move by each player).
Draw Conditions
- No Progress: 150 moves (75 by each player) without a capture or promotion.
- Impasse: the game is unable to progress due to neither side having a realistic chance of occupying all four Village Squares or capturing both enemy Chiefs.
Lose Conditions
- No Legal Moves: if a player cannot make a legal move they lose the game.
- Perpetual Check: (TODO: confirm this works for Chiefs).
- Move Repetiion: repeating a position for the 5th time.
The Board
The empty board and initial position for Borderlands are as follows:
Regions and Squares
There are a number of important regions and squares in Borderlands:
| Region | Board |
|---|---|
| White Territory |  |
| Ranks 1-5 | |
| All White pieces start the game within this region. | |
| White Village Zone |  |
| Ranks 1-3 | |
| The majority of White pieces start the game in this region. | |
| White Incursion Zone |  |
| Ranks 6-7 | |
| White Marauders must come into play in this region. Black Warriors initially guard every single square of it. | |
| White Promotion Zone |  |
| Ranks 8-10 | |
| All promotable White pieces (except the Lion) can promote anywhere within this region. | |
| White Villages |  |
| South-West Village: a1,b1,c1,a2,b2,c2,a3,b3,c3 South-East Village: g1,h1,i1,g2,h2,i2,g3,h3,i3 | |
| White Village Squares |  |
| South-West Village Square: b2 South-East Village Square: h2 | |
| White Lion's Yard |  |
| Squares: d1,e1,f1,d2,e2,f2,d3,e3,f3 | |
| White Lion's Den |  |
| Square: e2 | |
| White Lion's Incursion Squares |  |
| Squares: d7,f7 | |
| The White Lion must pass through one of these squares to promote. | |
| White Lion's Promotion Square |  |
| Square: e9 | |
| The White Lion promotes upon reaching this square, and is then able to freely roam the entire board. | |
| White Lion's Movement Zone |  |
| Zones: White Territory, White Lion's Incursion Zones, White Lion's Promotion Square | |
| Black Territory |  |
| Ranks 6-10 | |
| All Black pieces start the game within this region. | |
| Black Village Zone |  |
| Ranks 8-10 | |
| The majority of Black pieces start the game in this region. | |
| Black Incursion Zone |  |
| Ranks 4-5 | |
| Black Marauders must come into play in this region. White Warriors initially guard every single square of it. | |
| Black Promotion Zone |  |
| Ranks 1-3 | |
| All promotable Black pieces (except the Lion) can promote anywhere within this region. | |
| Black Villages |  |
| Noth-West Village: a8,b8,c8,a9,b9,c9,a10,b10,c10 Noth-East Village: g8,h8,i8,g9,h9,i9,g10,h10,i10 | |
| Black Village Squares |  |
| Noth-West Village Square: b9 Noth-East Village Square: h9 | |
| Black Lion's Yard |  |
| Squares: d8,e8,f8,d9,e9,f9,d10,e10,f10 | |
| Black Lion's Den |  |
| Square: e9 | |
| Black Lion's Incursion Squares |  | Squares: d4,f4 |
| The Black Lion must pass through one of these squares to promote. | |
| Black Lion's Promotion Square |  |
| Square: e2 | |
| The Black Lion promotes upon reaching this square, and is then able to freely roam the entire board. | |
| Black Lion's Movement Zone |  |
| Zones: Black Territory, Black Lion's Incursion Zones, Black Lion's Promotion Square | |
| Roads |  |
| East Road Squares: a4,a5,a6,a7 Middle Road Squares: e4,e5,e6,e7 West Road Squares: i4,i5,i6,i7 | |
| Roads connect the two Village Zones. | |
| Chief Movement Zone |  |
| Zones: White Village Zone, Black Village Zone, Roads | |
| Chiefs are restricted to the two Village Zones and Roads. |
The Pieces
Names, Movement, Notations, Icons, & Promotions
The movement diagrams below follow these conventions:
 | Can make both capturing and non-capturing moves to this square unimpeded. |
 | Can make a non-capturing move to this square unimpeded. |
 | Can make a capturing move to this square unimpeded. |
 | Can make a non-capturing slide up to three squares. |
 | Can make both a capturing and non-capturing sliding move, or jump a piece and capture in a manner similar to a Cannon. |
| Chief (C) | ||||
 Betza: KmNmAmD | ||||
| Chiefs are the most valuable pieces on the board. Capture both of the enemy Chiefs and your enemy immediately surrenders.Chiefs are restricted to the Village Zones and the Roads connecting them. | ||||
| Guard (G) | ||||
 Betza: KmNmAmD | ||||
| Guards are the only pieces that don't promote and are free to roam the entire board from the start of the game. Their role is to protect the allied Chiefs through any means necessary. | ||||
| Marauder (M) | Promoted Marauder (+M) | |
 Betza: FmN |  Betza: KmN | |
| The Marauder's role is to disrupt the enemy through any means necessary. They can very quickly slip behind enemy lines if there are small holes in the enemy's defenses. Marauders start the game in hand, and must come into play by being dropped into their Incursion Zone, and can often promote on their next move. Promoted Marauders move the same as Marauders, and gain the ability to make one step orthogonally (W). | ||
| Falcon (F) | Promoted Falcon (+F) | |
 Betza: WmAmD |  Betza: KmAmD | |
| TODO: Description here. | ||
| Elephant (E) | Promoted Elephant (+E) | |
 Betza: ADmR3 |  Betza: ADmR3WmF | |
| Promoted Elephants move the same as Elephants, and gain the ability to make one step orthogonally (W), and one non-capturing step diagonally (mF). | ||
| Horse (H) | Promoted Horse (+H) | |
 Betza: NmB3 |  Betza: NmB3FmW | |
| Promoted Horses move the same as Horses, and gain the ability to make one step diagonally (F), and one non-capturing step orthogonally (mW). | ||
| Slinger (S) | Promoted Slinger (+S) | |
 Betza: BcpBmW |  Betza: BcpBW | |
| Slingers are long range pieces able to attack from afar along diagonal lines. They can move like a Bishop (B), capture like a Vao (cpB), and also make one non-capturing step orthogonally (mW).Promoted Slingers move the same as Slingers, and gain the ability to make one capturing step orthogonally (W). | ||
| Archer (A) | Promoted Archer (+A) | |
 Betza: RcpRmF |  Betza: RcpRF | |
| Archers are long range pieces able to attack from afar along orthogonal lines. They can move like a Rook (R), capture like a Pao (cpR), and also make one non-capturing step diagonally (mF).Promoted Archers move the same as Archers, and gain the ability to make one capturing step diagonally (F). | ||
| Warrior (W) | Promoted Warrior (+W) | |
 Betza: fWfceFifmnD |  Betza: NADmQ3 | |
| TODO: Description here. | ||
| Lion (L) | Promoted Lion (+L) | |
 Betza: KNAD |  Betza: KNAD | |
| Lions start the game as a defensive piece restricted to their side's Territory, and have a very limited path to promotion (via the Lion's Incursion Squares) that is easily defended against. Upon reaching the Lion's Promotion Square, a Lion gains the ability to roam the entire board. | ||
Piece Values
| Piece | Notation | Value | Piece | Notation | Value |
| Promoted Lion | +L | 9.45 | Chief | C | 3.11 |
| Promoted Archer | +A | 8.82 | Promoted Falcon | +F | 2.51 |
| Promoted Warrior | +W | 6.75 | Guard | G | 2.17 |
| Archer | A | 5.77 | Horse | H | 2.16 |
| Promoted Slinger | +S | 4.88 | Elephant | E | 2.12 |
| Lion | L | 4.14 | Promoted Marauder | +M | 1.51 |
| Promoted Horse | +H | 3.94 | Warrior | W | 1.00 |
| Slinger | S | 3.81 | Falcon | F | 0.90 |
| Promoted Elephant | +E | 3.61 | Marauder | M | 0.65 |
Strategy
TODO.
How to Play Borderlands video:
TODO
Gameplay Example 1:
Gameplay Example 2: