SOWSOF Payment Route Planner is built on an enterprise-grade database of correspondent relations, which is commonly used by banks to send SWIFT payments.
1. Select sender's and beneficiary's banks by their SWIFT/BIC code.
2. Select a currency and build a route.
3. Make one change at a time to find an optimal route: change sender's banks, beneficiary's bank, currency.
Here you can see an example of Route Planner's results for sender's bank CenterCredit in Kazakhstan and beneficiary's bank Hipotekarna in Montenegro with USD as a currency. While CenterCredit has 5 different USD correspondents, none of them are common with Hipotekarna. Even worse, beneficiary's correspondent RBI (RZBAATWWXXX) works via Standard Chartered (SCBLUS33XXX), so you will always have 3 banks in between sender's bank and beneficiary's bank.
However if you change a currency to Euro, you have a common RBI as a correspondent bank (RZBAATWWXXX), so Euro looks safer for this payment.