MESON Chess Problem Database

Problem Display
PID: 102853 (b7/3R4/N3BK2/3N4/3kp3/1r1P4/8/3Q2b1 w - - 0 1)

Hermanson, Halvar

Scacco!, 1974

b7/3R4/N3BK2/3N4/3kp3/1r1P4/8/3Q2b1

#2

7 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd3
      • 2.Qa4#
    • 1...exd3
      • 2.Qg4#
  • Tries
    • 1.Qxb3?
      • threat
        • 2.Qc4#
        • 2.Qc3#
      • 1...exd3
        • 2.Qa4#
        • 2.Qb4#
      • 1...Bxd5!
    • 1.Qe1?
      • threat
        • 2.Qxe4#
      • 1...Kxd3
        • 2.Sdb4#
      • 1...Rxd3
        • 2.Qb4#
      • 1...Bxd5
        • 2.Rxd5#
      • 1...exd3
        • 2.Qh4#
      • 1...Be3
        • 2.Qxe3#
      • 1...e3!
    • 1.Qxg1+?
      • 1...e3
        • 2.Qxe3#
      • 1...Kxd3!
    • 1.dxe4+?
      • 1...Kxe4
        • 2.Bf5#
      • 1...Rd3
        • 2.Qa4#
      • 1...Kc4!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Qc4#
      • 1...Kxd3
        • 2.Sf4#
      • 1...Rxd3
        • 2.Qc5#
      • 1...Bxd5
        • 2.Rxd5#
      • 1...exd3
        • 2.Qf4#
      • 1...Rc3
        • 2.Qxc3#
      • 1...Rb4
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(b);OGATE,P_SPINR(b),SBLOCK,XP(B)::QAR(A)
    • P(d);OGATEB,P_SPINP(d),SBLOCK,XP(B)::QAR(A)
  • Tries
    • Try
      • Q(A);XR(b)
      • Threat
        • DUALS(2)
      • Refutation
        • B(e);P_SPINB(e),XS(C)
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(d)
      • Vars
        • K(c);P-FLIGHT,XP(B)::R(G)+S(C),DCHECK
        • R(b);N_GUARD,SBLOCK,XP(B)::QAR2(A)
        • B(e);OGATE,P_SPINB(e),XS(C)::R1(G),XB(e)
        • P(d);OGATEB,SBLOCK,XP(B)::QAR(A)
        • B(a);N_GUARD::QAB1(A),XB(a)
      • Refutation
        • P(d);
    • Try
      • Q(A);CHECK,XB(a)
      • Vars
        • P(d);P_SPINP(d)::QAB1(A),XP(d)
      • Refutation
        • K(c);P-FLIGHT,XP(B)
    • Try
      • P(B);CHECK,XP(d)
      • Vars
        • K(c);P-FLIGHT,XP(B)::B(E)
        • R(b);OGATE,P_SPINR(b),SBLOCK::QAR(A)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(c);P-FLIGHT,XP(B)::R(G)+S(C),DCHECK
      • R(b);SBLOCK,XP(B)::QAB1(A)
      • B(e);OGATE,P_SPINB(e),XS(C)::R1(G),XB(e)
      • P(d);OGATEB,SBLOCK,XP(B)::QAR2(A)
      • R(b);N_GUARD::QAB1(A),XR(b)
      • R(b);N_GUARD::QAB1(A)
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