MESON Chess Problem Database

Problem Display
PID: 226771 (2B5/5nKb/8/4k1p1/2pR2R1/1n1p1p2/1Q2P3/8 w - - 0 1)

Tkachenko, Sergiy Ivanovich

The Problemist, 2020

2B5/5nKb/8/4k1p1/2pR2R1/1n1p1p2/1Q2P3/8

#2

6 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Rgxe4#
    • 1...Bg8
      • 2.Rge4#
    • 1...Sa1
      • 2.Qb5#
    • 1...Sc1
      • 2.Qb5#
    • 1...Sd2
      • 2.Qb5#
    • 1...Sxd4
      • 2.Qxd4#
    • 1...Sa5
      • 2.Qb5#
  • Tries
    • 1.Rxd3+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...c3!
    • 1.Rd8+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...c3!
    • 1.Rxg5+?
      • 1...Bf5
        • 2.Rxf5#
      • 1...Sxg5!
    • 1.Qa3?
      • threat
        • 2.Qe7#
      • 1...Sxd4
        • 2.Qc5#
      • 1...Be4
        • 2.Rgxe4#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sd8
        • 2.Qd6#
      • 1...Bf5!
    • 1.exd3?
      • threat
        • 2.Qh2#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...Be4
        • 2.Rgxe4#
      • 1...Sd2
        • 2.Qb5#
      • 1...f2!
    • 1.exf3?
      • threat
        • 2.Qh2#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...Be4
        • 2.Rgxe4#
      • 1...Sd2
        • 2.Qb5#
      • 1...d2!
  • Keys
    • 1.e4!
      • threat
        • 2.Rd5#
      • 1...Bxe4
        • 2.Rgxe4#
      • 1...Sxd4
        • 2.Qh2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • B(h);N_GUARD::R1(D),XB(h)
    • B(h);N_GUARD::R1(D)
    • S(a);OGATE::QAR(A)
    • S(a);OGATE,P_SPINS(a),XR(C)::QAB1(A),XS(a)
  • Tries
    • Try
      • R(C);CHECK,XP(b)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • R(C);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • R(D);CHECK,XP(f)
      • Vars
        • B(h);N_GUARD,P_SPINB(h)::R1(D),XB(h)
      • Refutation
        • S(g);XR(D)
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • S(a);N_GUARD,XR(C)::QAR2(A)
        • B(h);N_GUARD::R1(D),XB(h)
        • S(a);N_GUARD::QAR2(A),XS(a)
        • S(g);N_GUARD::QAB1(A),XS(g)
        • S(g);N_GUARD::QAB1(A)
      • Refutation
        • B(h);
    • Try
      • P(B);XP(b)
      • Threat
        • QAB(A)
      • Vars
        • S(a);OGATE,P_SPINS(a),XR(C)::QAB1(A),XS(a)
        • B(h);N_GUARD::R1(D),XB(h)
        • S(a);OGATE::QAR(A)
      • Refutation
        • P(c);
    • Try
      • P(B);XP(c)
      • Threat
        • QAB(A)
      • Vars
        • S(a);OGATE,P_SPINS(a),XR(C)::QAB1(A),XS(a)
        • B(h);N_GUARD::R1(D),XB(h)
        • S(a);OGATE::QAR(A)
      • Refutation
        • P(b);
  • Actual
    • P(B);
    • Threat
      • QAB(A)+R(C),DCHECK
    • Vars
      • B(h);OGATE,XP(B)::R1(D),XB(h)
      • S(a);P_SPINS(a),SBLOCK,XR(C)::QAB(A)
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