diff --git a/src/8/5/805chess.cpp b/src/8/5/805chess.cpp
new file mode 100644
index 0000000..94df30b
--- /dev/null
+++ b/src/8/5/805chess.cpp
@@ -0,0 +1,32 @@
+#include <algorithm>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <iostream>
+#include <istream>
+#include <limits>
+
+using ll = int64_t;
+
+int main(){
+    std::iostream::sync_with_stdio(false);
+    // freopen("chess.in", "r", stdin);
+    // freopen("chess.out", "w", stdout);
+    ll t;
+    std::cin>>t;
+    while(t--){
+        ll n,m,sx,sy,tx,ty;
+        std::cin>>n>>m>>sx>>sy>>tx>>ty;
+        ll ans=std::numeric_limits<ll>::max();
+        for(ll i=-1;i<=1;i++){
+            for(ll j=-1;j<=1;j++){
+                ll nx=tx+n*i;
+                ll ny=ty+m*j;
+                ll ansx=abs(nx-sx);
+                ll ansy=abs(ny-sy);
+                ans=std::min(ans,std::max(ansx,ansy));
+            }
+        }
+        std::cout<<ans<<'\n';
+    }
+}
\ No newline at end of file
diff --git a/src/8/5/chess1.ans b/src/8/5/chess1.ans
new file mode 100644
index 0000000..fbb7fad
--- /dev/null
+++ b/src/8/5/chess1.ans
@@ -0,0 +1,5 @@
+1
+4
+2
+4
+1
diff --git a/src/8/5/chess1.in b/src/8/5/chess1.in
new file mode 100644
index 0000000..e58da5d
--- /dev/null
+++ b/src/8/5/chess1.in
@@ -0,0 +1,6 @@
+5
+9 1 0 0 1 0
+8 8 5 7 1 1
+3 6 2 4 0 0
+6 9 1 0 1 4
+6 3 3 1 4 0
diff --git a/src/8/5/chess2.ans b/src/8/5/chess2.ans
new file mode 100644
index 0000000..c60b9c8
--- /dev/null
+++ b/src/8/5/chess2.ans
@@ -0,0 +1,20 @@
+0
+6
+2
+5
+7
+2
+1
+2
+6
+1
+2
+5
+4
+9
+3
+5
+6
+3
+3
+6
diff --git a/src/8/5/chess2.in b/src/8/5/chess2.in
new file mode 100644
index 0000000..ec35b3e
--- /dev/null
+++ b/src/8/5/chess2.in
@@ -0,0 +1,21 @@
+20
+8 3 1 1 1 1
+17 19 1 13 12 9
+8 5 7 0 1 4
+18 16 15 5 15 0
+20 15 13 2 6 13
+10 15 1 9 0 7
+5 17 1 9 1 10
+5 2 2 0 0 0
+3 12 2 1 0 7
+14 6 10 2 10 3
+4 7 1 5 3 4
+15 14 5 11 0 1
+16 17 0 14 2 1
+16 19 7 12 1 2
+17 3 12 0 15 2
+2 16 0 10 0 15
+6 17 2 16 4 10
+18 9 17 0 2 0
+18 14 1 4 4 4
+13 9 9 6 2 0
diff --git a/src/8/5/chess3.ans b/src/8/5/chess3.ans
new file mode 100644
index 0000000..6e553b7
--- /dev/null
+++ b/src/8/5/chess3.ans
@@ -0,0 +1,50 @@
+385
+140
+229
+47
+264
+71
+111
+279
+121
+251
+56
+88
+77
+29
+16
+194
+92
+86
+280
+220
+105
+139
+481
+162
+28
+98
+253
+428
+61
+130
+311
+6
+200
+218
+160
+157
+22
+292
+146
+209
+258
+56
+297
+310
+230
+154
+137
+222
+290
+437
diff --git a/src/8/5/chess3.in b/src/8/5/chess3.in
new file mode 100644
index 0000000..cf1216e
--- /dev/null
+++ b/src/8/5/chess3.in
@@ -0,0 +1,51 @@
+50
+868 754 780 358 395 441
+906 399 426 269 286 308
+67 972 43 669 43 898
+102 94 88 39 27 86
+790 708 586 258 322 85
+937 748 100 459 29 485
+840 456 439 332 328 288
+776 594 546 103 692 382
+433 293 207 96 328 36
+198 829 39 154 98 732
+741 272 203 196 178 140
+920 445 341 169 429 249
+140 156 85 111 71 34
+128 936 60 64 85 35
+273 89 167 82 176 9
+516 46 292 32 98 38
+140 714 76 680 44 58
+222 460 113 10 131 384
+523 844 481 88 383 368
+668 235 529 215 309 137
+699 67 70 43 664 27
+128 369 92 269 11 39
+649 967 484 377 269 863
+183 549 30 15 9 402
+38 233 26 209 34 181
+35 708 9 35 14 645
+44 633 37 115 37 368
+923 825 102 450 597 121
+20 161 16 123 6 62
+304 439 209 183 35 75
+545 984 542 29 101 340
+297 871 129 743 123 745
+677 818 261 218 234 18
+886 878 541 702 393 484
+33 773 24 224 24 384
+773 374 585 348 428 101
+135 12 7 6 120 4
+186 634 117 69 148 411
+522 118 208 37 62 111
+505 12 435 2 226 0
+65 758 60 483 63 741
+620 433 481 126 425 144
+362 963 217 207 27 504
+682 146 116 83 426 114
+515 942 233 670 3 445
+300 627 56 197 224 351
+905 73 733 55 870 32
+752 717 520 609 638 387
+980 4 226 2 916 3
+896 294 610 191 173 289