MESON Chess Problem Database

Problem Display
PID: 228690 (5r2/4p3/3bKp2/3R4/1pNPkN2/3pP3/1pn5/4nQ2 w - - 0 1)

Derevchuk, Oleksandr Andrinovich

Permyakov, Evgeni Nikolaevich

2nd Prize, StrateGems, 2020

5r2/4p3/3bKp2/3R4/1pNPkN2/3pP3/1pn5/4nQ2

#2

7 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf4
      • 2.Qxf4#
    • 1...Sg2
      • 2.Qxg2#
    • 1...Sf3
      • 2.Qxd3#
    • 1...Sxe3
      • 2.Sd2#
    • 1...Sxd4+
      • 2.Rxd4#
  • Tries
    • 1.Sg2?
      • threat
        • 2.Sd2#
        • 2.Qf5#
      • 1...Sxd4+
        • 2.Rxd4#
      • 1...Sxg2
        • 2.Qxg2#
        • 2.Qf5#
      • 1...Sxe3
        • 2.Sd2#
      • 1...b1S
        • 2.Qf5#
      • 1...Bf4
        • 2.Sd2#
        • 2.Qxf4#
      • 1...d2
        • 2.Sxd2#
        • 2.Qf5#
      • 1...f5
        • 2.Sd2#
      • 1...Sf3!
    • 1.Sxd3?
      • threat
        • 2.Qf5#
      • 1...Sxd4+
        • 2.Rxd4#
      • 1...Sxe3
        • 2.Sd2#
      • 1...Sf3
        • 2.Sf2#
      • 1...Bf4
        • 2.Sc5#
      • 1...f5!
    • 1.Qh3?
      • threat
        • 2.Sd2#
      • 1...Sxd4+
        • 2.Rxd4#
      • 1...Sxe3
        • 2.Qxe3#
      • 1...Sf3
        • 2.Qf5#
      • 1...d2
        • 2.Sxd2#
      • 1...b1S!
    • 1.Qh1+?
      • 1...Sg2
        • 2.Qxg2#
      • 1...Sf3!
  • Keys
    • 1.Sh3!
      • threat
        • 2.Qf5#
      • 1...Sxd4+
        • 2.Rxd4#
      • 1...Sxe3
        • 2.Sd2#
      • 1...Sf3
        • 2.Sf2#
      • 1...Bf4
        • 2.Qxf4#
      • 1...f5
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(g);OGATE,XS(E)::QAR1(A),XB(g)
    • S(a);N_GUARD::QAB(A),XS(a)
    • S(a);N_GUARD,SBLOCK::QAB1(A),XP(d)
    • S(c);SBLOCK,XP(B)::S(C)
    • S(c);CHECK,OGATE,XP(D)::R1(F),XS(c)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);CHECK,OGATE,XP(D)::R1(F),XS(c)
        • S(c);XP(B)::S(C)
        • P(b);::QAB1(A)
        • P(h);::S(C)
      • Refutation
        • S(a);
    • Try
      • S(E);XP(d)
      • Threat
        • QAB1(A)
      • Vars
        • S(c);CHECK,OGATE,XP(D)::R1(F),XS(c)
        • S(c);SBLOCK,XP(B)::S(C)
        • S(a);SBLOCK::S(E)
        • B(g);N_GUARD::S(E)
      • Refutation
        • P(h);
    • Try
      • Q(A);
      • Threat
        • S(C)
      • Vars
        • S(c);CHECK,OGATE,XP(D)::R1(F),XS(c)
        • S(c);OGATE,XP(B)::QAR1(A),XS(c)
        • S(a);SBLOCK::QAB1(A)
        • P(d);::S(C),XP(d)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB(A),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • S(E);
    • Threat
      • QAB1(A)
    • Vars
      • S(c);CHECK,OGATE,XP(D)::R1(F),XS(c)
      • S(c);SBLOCK,XP(B)::S(C)
      • S(a);SBLOCK::S(E)
      • B(g);N_GUARD::QAR1(A),XB(g)
      • P(h);N_GUARD::S(E)
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