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Hearthstone is an official collectable-card game themed to Warcraft universe. Despite it's not chess, it may be loved by chess variantists, as all these variable cards have some spirit of chess variants community. However, this time it features a special chess-themed event, a mini-game, having the intermediate feeling between collectable-cards game and chess.

Here Kings take places of heroes, having 30HP each (20 in the harder Heroic mode) and being the goal to destroy. Other pieces are cards in the deck.

Unlike regular cards of Hearthstone, pawn, rook and queen don't attack according to the player's choice. Instead, they attack automatically at the end of their player's turn, and they attack the piece directly ahead. Since minions are always centered, piece attack two pieces ahead if players have different evennes of minons. If there are no pieces directly ahead, the minion attacks the opposing King (even if one opposing piece is "diagonally" ahead, it still blocks the King).  

Pawn, rook and queen are "regular" pieces of this mini-game, and the differ by their attack only (and the cost, of course), and they have an identical amount of health:

https://hydra-media.cursecdn.com/hearthstone.gamepedia.com/thumb/a/ad/White_Queen(42250).png/200px-White_Queen(42250).png?version=d2daf6cbd89112013af6c647844cac0b
https://hydra-media.cursecdn.com/hearthstone.gamepedia.com/thumb/d/d2/Black_Pawn(42242).png/200px-Black_Pawn(42242).png?version=c23c04d8f36b3b468ab9eacc601d68e6
https://hydra-media.cursecdn.com/hearthstone.gamepedia.com/thumb/0/01/Black_Rook(42244).png/200px-Black_Rook(42244).png?version=ab09200321f8e240721aa730da991824

Bishop and knight are rather special:

https://hydra-media.cursecdn.com/hearthstone.gamepedia.com/thumb/8/87/Black_Knight(42248).png/200px-Black_Knight(42248).png?version=0dc5d3cf57e5616f4fbe797a4210e48a
https://hydra-media.cursecdn.com/hearthstone.gamepedia.com/thumb/8/83/Black_Bishop(42247).png/200px-Black_Bishop(42247).png?version=585493139b05eb442b249d2e071772cb

Unlike other pieces, knight don't do auto-attack. Instead, it attacks a certain piece by player's choise (can't attack the King), and gets counter-attacked according to power of attacked piece.

Bishop, as you can see on the picture, plays the role of healer.

White King, controlles by player, also have power to take one of 3 randomly-suggested pieces, giving two mana-points (this power is named "castling"). Black King, controlled by computer, have "cheating" power of the same cost - he may destroy the external-left whit piece.

In the Heroic mode, black King's power is the same, and the White instead have option to move one piece to left (it costs 1 mana and may be used several times per turn). Also, in the Heroic mode the white player has less cards.