MESON Chess Problem Database

Problem Display
PID: 143348 (5R1q/6Bb/5n1r/Q4Pbp/3RNkpr/3B1P1P/2N3P1/2K5 w - - 0 1)

Shanshin, Valery Yurevich

4th Comm., The Problemist, 2011

5R1q/6Bb/5n1r/Q4Pbp/3RNkpr/3B1P1P/2N3P1/2K5

#2

12 + 9

56 The Problemist 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf5
      • 2.Qc7#
    • 1...Sxe4
      • 2.Qe5#
    • 1...Sd7
      • 2.Qd2#
    • 1...Se8
      • 2.Qd2#
      • 2.Qe5#
    • 1...Sg8
      • 2.Qd2#
      • 2.Qe5#
    • 1...gxf3
      • 2.g3#
    • 1...g3
      • 2.Sxf6#
  • Tries
    • 1.Sd2+?
      • 1...Se4
        • 2.Qe5#
      • 1...Kg3!
    • 1.Sf2+?
      • 1...Se4
        • 2.Qe5#
      • 1...Kg3+!
    • 1.Sc3+?
      • 1...Se4
        • 2.Se2#
        • 2.Qe5#
      • 1...Kg3+!
    • 1.Sg3+?
      • 1...Se4
        • 2.Se2#
        • 2.Qe5#
      • 1...Kxg3+!
    • 1.Sd6+?
      • 1...Se4
        • 2.Qe5#
      • 1...Kg3+!
    • 1.Be2?
      • threat
        • 2.g3#
      • 1...Sxe4
        • 2.Qe5#
      • 1...g3
        • 2.Sxf6#
      • 1...Rxh3!
  • Keys
    • 1.Qe1!
      • threat
        • 2.Sxf6#
      • 1...Ke5+
        • 2.Sxg5#
      • 1...Kxf5+
        • 2.Sd2#
      • 1...Bxf5
        • 2.Qg3#
      • 1...Sxe4
        • 2.Rxe4#
      • 1...Sd5
        • 2.Sd2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sd6#
        • 2.Sf6#
        • 2.Qg3#
      • 1...Sd7
        • 2.Sd2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sd6#
        • 2.Sf6#
        • 2.Qd2#
        • 2.Qg3#
        • 2.Qe3#
      • 1...Se8
        • 2.Sd2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sd6#
        • 2.Sf6#
        • 2.Qd2#
        • 2.Qg3#
        • 2.Qe3#
      • 1...Sg8
        • 2.Sd2#
        • 2.Sc3#
        • 2.Sg3#
        • 2.Sc5#
        • 2.Sd6#
        • 2.Sf6#
        • 2.Qd2#
        • 2.Qg3#
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(h);SBLOCK,XP(J)::QAB(I)
    • S(f);P_SPINS(f),XS(H)::QAB1(I)
    • S(f);::QAB(I)
    • P(b);SBLOCK,XP(E)::P(C)
    • P(b);SBLOCK::R(G)+S(H),XS(f)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • S(f);P_SPINS(f)::QAB1(I)
      • Refutation
        • K(a);P_PINS(H),S_FLIGHT
    • Try
      • S(H);CHECK
      • Vars
        • S(f);P_SPINS(f)::QAB1(I)
      • Refutation
        • K(a);CHECK,S_FLIGHT
    • Try
      • S(H);CHECK
      • Refutation
        • K(a);CHECK,S_FLIGHT
    • Try
      • S(H);CHECK
      • Refutation
        • K(a);CHECK,S_FLIGHT,XS(H)
    • Try
      • S(H);CHECK
      • Vars
        • S(f);P_SPINS(f)::QAB1(I)
      • Refutation
        • K(a);CHECK,S_FLIGHT
    • Try
      • B(D);
      • Threat
        • P(C)
      • Vars
        • S(f);P_SPINS(f),XS(H)::QAB1(I)
        • P(b);SBLOCK::R(G)+S(H),XS(f)
      • Refutation
        • R(c);XP(F)
  • Actual
    • Q(I);
    • Threat
      • R(G)+S(H),XS(f)
    • Vars
      • K(a);CHECK,P_SPINS(f),S_FLIGHT::QAR(I)+S(H),XB(d)
      • K(a);CHECK,P-FLIGHT,P_SPINS(f),XP(J)::B(D)+S(H)
      • B(h);SBLOCK,XP(J)::QAB1(I)
      • S(f);OGATE,P_SPINS(f),XS(H)::R1(G),XS(f)
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