MESON Chess Problem Database

Problem Display
PID: 216435 (5R2/8/4n3/4N2b/1B6/3Bk2n/7K/Q7 w - - 0 1)

Kalina, Vasily Emanuilovich

Deutsche Schachzeitung, 1927

5R2/8/4n3/4N2b/1B6/3Bk2n/7K/Q7

#2

6 + 4

15148 Sadier Collection 2020
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Bf3
      • 2.Rxf3#
    • 1...Bg6
      • 2.Rf3#
    • 1...Be8
      • 2.Rf3#
    • 1...Sg1
      • 2.Qxg1#
    • 1...Shf4
      • 2.Qg1#
    • 1...Shg5
      • 2.Qg1#
    • 1...Sd4
      • 2.Qc1#
    • 1...Sef4
      • 2.Qa7#
    • 1...Seg5
      • 2.Qa7#
    • 1...Sc7
      • 2.Qa7#
    • 1...Sg7
      • 2.Qa7#
    • 1...Sd8
      • 2.Qa7#
  • Tries
    • 1.Qe1+?
      • 1...Kd4
        • 2.Qe4#
      • 1...Be2!
    • 1.Qg1+?
      • 1...Sf2
        • 2.Qxf2#
      • 1...Sxg1!
    • 1.Qa7+?
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sd4!
  • Keys
    • 1.Rf4!
      • threat
        • 2.Qc1#
      • 1...Kxf4
        • 2.Bd2#
      • 1...Shxf4
        • 2.Qg1#
      • 1...Sexf4
        • 2.Qa7#
      • 1...Bf3
        • 2.Rxf3#

Anticipated by 102285(1916)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • B(c);N_GUARD::R1(F),XB(c)
    • B(c);N_GUARD::R1(F)
    • S(b);N_GUARD::QAB(A),XS(b)
    • S(b);N_GUARD::QAB(A)
    • S(d);SBLOCK::QAB(A)
    • S(d);N_GUARD::QAB(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(A)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • Q(A);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAB1(A),XS(b)
      • Refutation
        • S(b);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAB(A),XS(d)
      • Refutation
        • S(d);P_SPINS(d)
  • Actual
    • R(F);
    • Threat
      • QAB(A)
    • Vars
      • K(a);S_FLIGHT,XR(F)::B(D)
      • S(b);N_GUARD,SBLOCK,XR(F)::QAB(A)
      • S(d);N_GUARD,SBLOCK,XR(F)::QAB(A)
      • B(c);N_GUARD::R1(F),XB(c)
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