increase consecutive-same-algo limit to 6 blocks

src/main.cpp

@@ -2702,6 +2702,11 @@ bool AcceptBlock(CBlock& block, CValidationState& state, CDiskBlockPos* dbp)
                 nAlgoCount++;
                 piPrev = piPrev->pprev;
             }
+			if ((nHeight > nBlockSequentialAlgoRuleStart3) && (nAlgoCount > nBlockSequentialAlgoMaxCount3))
+			{
+                return state.DoS(100, error("AcceptBlock() : too many blocks from same algo"),
+                                 REJECT_INVALID, "algo-toomany");
+			} else
             if ((nHeight > nBlockSequentialAlgoRuleStart2) && (nAlgoCount > nBlockSequentialAlgoMaxCount2))
             {
                 return state.DoS(100, error("AcceptBlock() : too many blocks from same algo"),

src/main.h

@@ -708,8 +708,10 @@ const int64_t nBlockAlgoNormalisedWorkDecayStart = 866000; // block where weight
 const int64_t nBlockAlgoNormalisedWorkDecayStart2 = 932000; // block where weight decay starts
 const int64_t nBlockSequentialAlgoRuleStart = 740000; // block where sequential algo rule starts
 const int64_t nBlockSequentialAlgoRuleStart2 = 766000; // block where sequential algo rule starts
+const int64_t nBlockSequentialAlgoRuleStart3 = 1400000; // block where sequential algo rule starts
 const int nBlockSequentialAlgoMaxCount = 6; // maximum sequential blocks of same algo
 const int nBlockSequentialAlgoMaxCount2 = 3; // maximum sequential blocks of same algo
+const int nBlockSequentialAlgoMaxCount3 = 6; // maximum sequential blocks of same algo
 const int64_t nBlockTimeWarpPreventStart = 740500; // block where time warp 1 prevention starts
 const int64_t nBlockTimeWarpPreventStart2 = 766000; // block where time warp 2 prevention starts
 const int64_t nBlockDiffAdjustV2 = 766000; // block where difficulty adjust V2 starts