International Solving Contest (ISC)

Current Rules

The 1^st International Solving Contest (ISC) was organized on the 23rd January, 2005. Invitation and information for the PCCC delegates are on a separate document (RTF document, 13 kb). The final results indicate that 262 solvers from 23 countries participated in total.
Problems cat.1 | Solutions cat.1
2. ISC was held on Sunday January 22, 2006.
Invitation and information for the PCCC delegates (RTF document 12 kb) | Results
Problems cat.1 | Problems cat.2 | Solutions cat.1 | Solutions cat.2
3. ISC was held on Sunday January 21st, 2007.
Results | Problems cat.1 | Problems cat.2 | Solutions cat.1 | Solutions cat.2
4. ISC was held on Sunday January 27, 2008.
Invitation and information for the PCCC delegates (RTF document 13 kb) | Results
Problems cat.1 | Problems cat.2 | Solutions cat.1 | Solutions cat.2
5. ISC January 25, 2009.
Invitation (MS Word document) | Problems | Solutions | Results
6. ISC January 24, 2010, director Peter Bakker.
Invitation | Invitation (MS Word document) | Problems | Solutions | Results
7. ISC January 23, 2011, director Axel Steinbrink.
Invitation | Invitation (MS Word document) | Problems | Solutions | Results
8. ISC January 29, 2012, director Axel Steinbrink.
Invitation | Invitation (MS Word document) | Problems | Solutions | Results
9. ISC January 27, 2013, director Axel Steinbrink.
Invitation | Invitation (MS Word document) | Problems | Solutions | Results
10. ISC January 26, 2014, central controllers: Gligor Denkovski & Ivan Denkovski.
Invitation | Invitation (PDF format) | Problems cat.1 | Problems cat.2 |
Solutions cat.1 | Solutions cat.2 | Results
11. ISC January 25, 2015, central controllers: Gligor Denkovski & Ivan Denkovski.
Invitation | Invitation (PDF format) | Problems cat.1 | Problems cat.2 | Problems cat.3 |
Solutions cat.1 | Solutions cat.2 | Solutions cat.3 | Results
12. ISC January 24, 2016, central controllers: Axel Steinbrink & Luc Palmans.
Invitation | Invitation (PDF format) | Problems cat.1 | Problems cat.2 | Problems cat.3 |
Solutions cat.1 | Solutions cat.2 | Solutions cat.3 | Results
13. ISC January 29, 2017, central controllers: Axel Steinbrink & Luc Palmans.
Invitation | Invitation (PDF format) | Problems cat.1 | Problems cat.2 | Problems cat.3 |
Solutions cat.1 | Solutions cat.2 | Solutions cat.3 | Results
14. ISC January 28, 2018, central controllers: Axel Steinbrink & Luc Palmans.
Invitation (PDF format) | Problems cat.1 | Problems cat.2 | Problems cat.3 |
Solutions cat.1 | Solutions cat.2 | Solutions cat.3 | Results | ISC 2018 statistics |
ISC 2018 analysis of study-solutions | statistics of ISCs 1-14
15. ISC January 27, 2019, central controllers: Axel Steinbrink & Luc Palmans.
Invitation (PDF format) | Problems cat.1 | Problems cat.2 | Problems cat.3 |
Solutions cat.1 | Solutions cat.2 | Solutions cat.3 | Results | ISC 2019 statistics |
ISC 2019 analysis of study-solutions
16. ISC January 26, 2020, central controllers: Axel Steinbrink & Luc Palmans.
Presentation of the results | Invitation (post) | Problems cat.1 | Problems cat.2 | Problems cat.3 |
Solutions cat.1 | Solutions cat.2 | Solutions cat.3 |
ISC 2020 Winners | ISC 2020 statistics | ISC 2020 analysis of study-solutions
ISC TOP 100 2005-2020
17. ISC January 24, 2021, central controllers: Axel Steinbrink & Luc Palmans.
Presentation of the results | Invitation (post) | Problems cat.1 | Problems cat.2 | Problems cat.3 |
Solutions cat.1 | Solutions cat.2 | Solutions cat.3
ISC 2021 Winners | ISC 2021statistics | ISC 2021 analysis of study-solutions | ISC 2021 TOP 100
18. ISC January 23, 2022, central controllers: Axel Steinbrink & Luc Palmans.
Presentation of the results | Problems CAT1 – CAT2 – CAT3 | Solutions CAT1 – CAT2 – CAT3
Results Category 1 (94 solvers) | Category 2 (166 solvers) | Category 3 (325 solvers)
Statistics ISC 2022 | ISC 2022 Studies-Analysis | ISC 2022 Winners | ISC 2022 TOP 100
19. ISC January 29, 2023, central controllers: Axel Steinbrink & Luc Palmans.
Presentation of the results | ISC 2023 Winners | Category 1 (181 solvers) | Category 2 (172 solvers) | Category 3 (248 solvers) | Problems CAT1 – CAT2 – CAT3 | Solutions CAT1 – CAT2 – CAT3
20. ISC January 21, 2024, central controller: Arvydas Mockus.
Presentation of the results | Results CAT1 (171 solvers) – CAT2 (236 solvers) – CAT3 (238 solvers)
Problems CAT1 – CAT2 – CAT3 | Solutions CAT1 – CAT2 – CAT3
21. ISC January 19, 2025, central controller: Arvydas Mockus.
Results Report & Summaries – CAT 1 (180 solvers) – CAT 2 (254 solvers) – CAT 3 (292 solvers)
Problems CAT 1 – CAT 2 – CAT 3 | Solutions CAT 1 – CAT 2 – CAT 3
22. ISC January 25, 2026, central controller: Arvydas Mockus.
Presentation of the results | Results CAT1 (162 solvers) – CAT2 (346 solvers) – CAT3 (443 solvers)
Problems CAT1 – CAT2 – CAT3 | Solutions CAT1 – CAT2 – CAT3