Puzzle archive

Every puzzle from every year of Advent of Chess.

2025

24 puzzles
1

Reach this position in 5 moves

Proof game · Retrograde

Medium
2

Helpmate in 2

Helpmate

Easy
3

Serieshelpmate

Serieshelpmate

Easy
4

Add King and mate

Placement mate

Medium
5

Selfmate in 2

Selfmate

Easy
6

Find the mate

Construction

Medium
7

Helpmate in 2!

Helpmate

Easy
8

Find the pieces behind the numbers

Hidden pieces

Easy
9

Retract White's last move, then mate in 2!

Retractor

Easy
10

Checkless Helpmate

Checkless · Helpmate

Easy
11

Place the pieces

Construction

Hard
12

Construct a game that ends with 6. BxRc4#

Construction

Brutal
13

Black makes 20 consecutive moves, then White mates in 1

Serieshelpmate

Easy
14

Rotate the position

Easy
15

Selfmate in 4 moves

Selfmate

Hard
16

Proof game

Proof game

Medium
17

Helpstalemate

Helpmate

Medium
18

Helpmate in 5

Helpmate

Medium
19

Mate in 2

Directmate

Easy
20

Retractor

Retractor

Hard
21

Get to this position in 10.5 moves

Proof game

Hard
22

Black plays 37 moves in a row, then White mates in 1

Serieshelpmate

Medium
23

What were the last 7 moves?

Retrograde

Brutal
24

Tacu's Enigma

Proof game · Retrograde

Holy Hell

2024

24 puzzles
1

Reach this position in 6 moves

Proof game

Easy
2

2 - Helpmate in 3

Helpmate

Hard
3

Helpnotmate

Easy
4

Selfmate

Selfmate

Easy
5

Add a piecee

Placement mate

Easy
6

Add a square

Add a square

Easy
7

Serieshelpstalemate

Medium
8

Construction

Construction

Brutal
9

PG 7

Proof game

Medium
10

10

Helpmate

Medium
11

11

Retractor

Medium
12

12

Serieshelpmate

Medium
13

13 - Guarded pieces

Medium
14

14

Retrograde

Hard
15

15 - Selfmate

Selfmate

Brutal
16

Day 16

Proof game

Hard
17

17

Coloring

Medium
18

18 - checkless

Checkless

Hard
19

19

Retractor · Helpmate

Brutal
20

20

Placement mate

Medium
21

21

Checkless

Hard
22

22

Retrograde

Hard
23

23

Helpmate

Medium
24

Decode the chess game

Proof game

Holy Hell

2023

24 puzzles
1

Proof game 4.0

Proof game · Retrograde

Easy
2

Qd7# One-sided chess

Medium
3

Helpmate in 2

Helpmate

Easy
4

Mirror chess

Mirror

Medium
5

Selfmate in 2

Selfmate

Easy
6

Serieshelpmate

Serieshelpmate

Easy
7

Kf6#

Construction

Hard
8

Helpmate 5?

Helpmate

Hard
9

Checkless

Checkless · Helpmate

Hard
10

10 - a3

Construction · Helpmate

Brutal
11

Selfmate #4

Selfmate

Medium
12

12 - PG?

Proof game · Retrograde

Hard
13

13 - reflexmate

Reflexmate

Medium
14

14 - serieshelpmate

Serieshelpmate

Hard
15

15 - retractor

Retractor

Medium
16

16 - ?

Helpmate

Hard
17

17 - retrograde

Retrograde

Hard
18

18 - add a piece mate in 2

Placement mate

Medium
19

19 - ditto

Ditto chess

Hard
20

Selfmate in 4

Selfmate

Brutal
21

Mirror chess

Mirror

Brutal
22

22 -

Proof game

Hard
23

23 - stuff

Retractor · Retrograde · Helpmate

Hard
24

24 -

Helpmate

Hard

2021

24 puzzles
1

Qh5

2

2. Construction

3

Miltner, Vratislav helpmate in 3

4

Seriesmover #s5

5

Day 5

6

6 - Construction en passant mate

7

7

8

8 - Construction king mate?

9

9 - Construct a game that

10

10 - mate

11

11 Seriesmate

12

10 - Proof Game

13

13

14

14 - selfmate

15

15 -

16

16 - text

17

17 - retrograde, last 3 moves

18

18 -

19

19 - help

20

20

21

21 - Proof Game

22

22

23

23

24

24