MESON Chess Problem Database

Problem Display
PID: 241346 (4r2Q/3p2q1/1b1Bp1N1/1P1k4/K1NP3r/4p3/B3P3/3R4 w - - 0 1)

Gavrilov, Constantin Grigorievich

Skakbladet, 1936

4r2Q/3p2q1/1b1Bp1N1/1P1k4/K1NP3r/4p3/B3P3/3R4

#2

10 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4
      • 2.Qe5#
    • 1...Qe5
      • 2.Qxe5#
    • 1...Qh6
      • 2.Qe5#
    • 1...Qf8
      • 2.Qe5#
    • 1...Qxg6
      • 2.Qe5#
    • 1...Qe7
      • 2.Qe5#
    • 1...Qf7
      • 2.Qe5#
    • 1...Qh7
      • 2.Qe5#
    • 1...Qg8
      • 2.Qe5#
    • 1...Rh1
      • 2.Qxh1#
    • 1...Rxd4
      • 2.Qh1#
    • 1...Re7
      • 2.Qa8#
    • 1...Ra8+
      • 2.Qxa8#
  • Tries
    • 1.Sxb6+?
      • 1...Ke4
        • 2.Bb1#
      • 1...Kxd6!
    • 1.Sf4+?
      • 1...Ke4
        • 2.Bb1#
      • 1...Rxf4!
    • 1.Be7?
      • threat
        • 2.Sd6#
      • 1...Ra8+
        • 2.Qxa8#
      • 1...Ke4
        • 2.Sd6#
      • 1...Qxd4
        • 2.Qe5#
      • 1...Qxe7
        • 2.Qe5#
      • 1...Rxd4
        • 2.Qh1#
      • 1...Rxe7
        • 2.Qa8#
      • 1...Bxd4
        • 2.Sd2#
      • 1...d6
        • 2.Sxd6#
      • 1...Rc8!
  • Keys
    • 1.Se7+!
      • 1...Ke4
        • 2.Bb1#
      • 1...Qxe7
        • 2.Qe5#
      • 1...Rxe7
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 11
  • Sets
    • Q(g);OGATE,P_PINS(E),P_SPINQ(g),XP(F)::QAR1(J)
    • Q(g);OGATE::QAR1(J),XQ(g)
    • Q(g);OGATE::QAR1(J)
    • Q(g);OGATE,XS(I)::QAR1(J)
    • R(b);OGATE::QAB(J),XR(b)
    • R(b);OGATE,P_PINS(E),P_SPINR(b),XP(F)::QAB(J)
    • R(h);OGATE::QAB(J)
    • R(h);CHECK,OGATE::QAB(J),XR(h)
  • Tries
    • Try
      • S(E);CHECK,P_SPINP(F),XB(d)
      • Vars
        • K(c);N_PINP(F),S_FLIGHT::B(B)
      • Refutation
        • K(c);P-FLIGHT,XB(H)
    • Try
      • S(I);CHECK
      • Vars
        • K(c);S_FLIGHT::B(B)
      • Refutation
        • R(b);XS(I)
    • Try
      • B(H);
      • Threat
        • B(B)+S(E)
      • Vars
        • R(h);CHECK,OGATE::QAB(J),XR(h)
        • K(c);S_FLIGHT::S(E)
        • Q(g);OGATE,P_PINS(E),P_SPINQ(g),XP(F)::QAR1(J)
        • Q(g);OGATE,XB(H)::QAR1(J)
        • R(b);OGATE,P_PINS(E),P_SPINR(b),XP(F)::QAB(J)
        • R(h);OGATE,XB(H)::QAB(J)
        • B(d);P_SPINB(d),SBLOCK,XP(F)::B(B)+S(E)
        • P(f);::B(B)+S(E),XP(f)
      • Refutation
        • R(h);
  • Actual
    • S(I);CHECK
    • Vars
      • K(c);S_FLIGHT::B(B)
      • Q(g);OGATE,XS(I)::QAR1(J)
      • R(h);OGATE,XS(I)::QAB(J)
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