MESON Chess Problem Database

Problem Display
PID: 241392 (7b/q1ppQ3/p7/R1n1nkPP/4r1R1/4PP2/B1N1K3/8 w - - 0 1)

Hjelle, David

Parallele 50, 1948

7b/q1ppQ3/p7/R1n1nkPP/4r1R1/4PP2/B1N1K3/8

#2

10 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe3+
      • 2.Sxe3#
    • 1...Rd4
      • 2.Sxd4#
    • 1...Rf4
      • 2.Rxf4#
    • 1...Bf6
      • 2.Qxf6#
    • 1...Sb3
      • 2.Qxd7#
    • 1...Scd3
      • 2.Qxd7#
      • 2.Qh7#
    • 1...Sa4
      • 2.Qxd7#
      • 2.Qh7#
    • 1...Se6
      • 2.Qh7#
    • 1...Sb7
      • 2.Qxd7#
      • 2.Qh7#
    • 1...Sed3
      • 2.Qxe4#
    • 1...Sxf3
      • 2.Qxe4#
    • 1...Sc4
      • 2.Qxe4#
    • 1...Sxg4
      • 2.fxe4#
    • 1...Sc6
      • 2.Qxe4#
    • 1...Sg6
      • 2.Qxe4#
    • 1...Sf7
      • 2.Qxe4#
  • Tries
    • 1.Be6+?
      • 1...Sxe6
        • 2.Qh7#
      • 1...dxe6!
    • 1.Qf8+?
      • 1...Bf6
        • 2.Qxf6#
      • 1...Sf7!
    • 1.Qf7+?
      • 1...Bf6
        • 2.Qxf6#
      • 1...Sxf7!
    • 1.fxe4+?
      • 1...Sxe4
        • 2.Rf4#
        • 2.Qxd7#
      • 1...Kxg4!
  • Keys
    • 1.Bb1!
      • threat
        • 2.Sd4#
      • 1...Rxe3+
        • 2.Sxe3#
      • 1...Sxf3
        • 2.Qxe4#
      • 1...Sxg4
        • 2.fxe4#
      • 1...Rd4
        • 2.Sxd4#
      • 1...Sb3
        • 2.Qxd7#
      • 1...Scd3
        • 2.Qxd7#
      • 1...Sa4
        • 2.Qxd7#
      • 1...Se6
        • 2.Qh7#
      • 1...Sb7
        • 2.Qxd7#
      • 1...Sed3
        • 2.Qxe4#
      • 1...Sc4
        • 2.Qxe4#
      • 1...Sc6
        • 2.Qxe4#
      • 1...Sg6
        • 2.Qxe4#
      • 1...Sf7
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(a);CHECK,XP(D)::S(B),XR(a)
    • R(a);N_GUARD,N_PINP(D)::S(B),XR(a)
    • R(a);N_GUARD,N_PINP(D)::R1(F),XR(a)
    • B(i);N_GUARD::QAR1(J),XB(i)
    • S(b);N_GUARD,P_SPINS(c)::QAB(J),XP(h)
    • S(b);P_SPINS(c)::QAB(J)
    • S(c);OGATE,P_SPINS(b)::QAB1(J),XR(a)
    • S(c);OGATE,P_SPINS(b),XP(E)::QAB1(J),XR(a)
    • S(c);P_SPINS(b),SBLOCK,XR(F)::P(E),XR(a)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • S(b);P_SPINS(c),SBLOCK,XB(A)::QAB(J)
      • Refutation
        • P(h);XB(A)
    • Try
      • Q(J);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAR1(J),XB(i)
      • Refutation
        • S(c);P_SPINS(b)
    • Try
      • Q(J);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAR1(J),XB(i)
      • Refutation
        • S(c);P_SPINS(b),XQ(J)
    • Try
      • P(E);CHECK,N_SPINP(D),XR(a)
      • Refutation
        • K(d);S_FLIGHT,XR(F)
  • Actual
    • B(A);
    • Threat
      • S(B)
    • Vars
      • R(a);CHECK,XP(D)::B(A)+S(B),DCHECK,XR(a)
      • S(c);OGATE,P_SPINS(b),XP(E)::QAB1(J),XR(a)
      • S(c);P_SPINS(b),SBLOCK,XR(F)::P(E),XR(a)
      • R(a);N_PINP(D)::B(A)+S(B),DCHECK,XR(a)
      • S(b);N_GUARD,P_SPINS(c)::QAB(J),XP(h)
      • S(b);P_SPINS(c),SBLOCK::QAB(J)
      • S(c);OGATE,P_SPINS(b)::QAB1(J),XR(a)
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