MESON Chess Problem Database

Problem Display
PID: 168176 (1KN5/1p1BPrp1/6r1/RN2k1p1/3p1bPB/3P4/3Q4/5R2 w - - 0 1)

Loshinski, Lev Ilich

64 Shakhmatnoe obozrenie, 1929

1KN5/1p1BPrp1/6r1/RN2k1p1/3p1bPB/3P4/3Q4/5R2

#2

11 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5+
      • 2.Sc7#
    • 1...Kf6+
      • 2.Qxf4#
  • Tries
    • 1.Sa3+?
      • 1...Kf6+
        • 2.Rxf4#
        • 2.Qxf4#
      • 1...b5!
    • 1.Sc3+?
      • 1...Kf6+
        • 2.Rxf4#
        • 2.Qxf4#
      • 1...b5!
    • 1.Sbd6+?
      • 1...Kf6
        • 2.Rxf4#
        • 2.Rf5#
        • 2.Qxf4#
        • 2.e8S#
      • 1...b5!
    • 1.Sba7+?
      • 1...Kf6+
        • 2.Rxf4#
        • 2.Qxf4#
      • 1...b5!
    • 1.Sc7+?
      • 1...Kf6
        • 2.Rxf4#
        • 2.Rf5#
        • 2.Qxf4#
        • 2.e8S#
      • 1...b5!
    • 1.Re1+?
      • 1...Kd5+
        • 2.Sc7#
      • 1...Kf6+
        • 2.Qxf4#
      • 1...Be3!
    • 1.Qe1+?
      • 1...Kd5+
        • 2.Sc7#
      • 1...Kf6+
        • 2.Rxf4#
      • 1...Be3!
    • 1.Qe2+?
      • 1...Kd5+
        • 2.Sc7#
      • 1...Kf6+
        • 2.Rxf4#
      • 1...Be3!
    • 1.e8Q+?
      • 1...Kd5+
        • 2.Sc7#
      • 1...Kf6+
        • 2.Rxf4#
        • 2.Qxf4#
      • 1...Re6
        • 2.Qxe6#
      • 1...Re7!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qxd4#
      • 1...Kd5+
        • 2.Sc7#
      • 1...Kf6+
        • 2.Qd6#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Be3
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);CHECK,P-FLIGHT::R(F)+S(G),DCHECK
    • K(c);CHECK,P_SPINB(b),P_SPINP(d),S_FLIGHT::QAR2(B),XB(b)
  • Tries
    • Try
      • S(G);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • S(G);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • S(G);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • S(G);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • S(G);CHECK
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • R(A);CHECK
      • Vars
        • K(c);CHECK,P-FLIGHT::R(F)+S(G),DCHECK
        • K(c);CHECK,P_SPINP(d),S_FLIGHT::QAR2(B),XB(b)
      • Refutation
        • B(b);P_SPINB(b)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);CHECK,P-FLIGHT::R(F)+S(G),DCHECK
        • K(c);CHECK,P_SPINB(b),P_SPINP(d),S_FLIGHT::R(A),XB(b)
      • Refutation
        • B(b);P_SPINB(b)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);CHECK,P-FLIGHT::R(F)+S(G),DCHECK
        • K(c);CHECK,P_SPINB(b),P_SPINP(d),S_FLIGHT::R(A),XB(b)
      • Refutation
        • B(b);P_SPINB(b)
    • Try
      • P(I);CHECK
      • Vars
        • K(c);CHECK,P-FLIGHT::R(F)+S(G),DCHECK
        • R(e);N_GUARD,P_SPINR(e)::QAR1(I),XR(e)
      • Refutation
        • R(g);P_SPINR(g)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B),XP(a)
    • Vars
      • K(c);CHECK,P-FLIGHT::R(F)+S(G),DCHECK
      • K(c);CHECK,P_SPINB(b),P_SPINP(d),S_FLIGHT::QAR2(B)
      • R(e);N_GUARD::QAB1(B),XR(e)
      • B(b);::QAR2(B)
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